201278601678361 has 3 divisors (see below), whose sum is σ = 201278615865631. Its totient is φ = 201278587491092.

The previous prime is 201278601678251. The next prime is 201278601678397. The reversal of 201278601678361 is 163876106872102.

The square root of 201278601678361 is 14187269.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 65564955533961 + 135713646144400 = 8097219^2 + 11649620^2 .

It is not a de Polignac number, because 201278601678361 - 2²⁵ = 201278568123929 is a prime.

It is a super-4 number, since 4×201278601678361⁴ (a number of 58 digits) contains 4444 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201278601678296 and 201278601678305.

It is not an unprimeable number, because it can be changed into a prime (201278601673361) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 7093635 + ... + 21280903.

Almost surely, 2^{201278601678361} is an apocalyptic number.

201278601678361 is the 14187269-th square number.

201278601678361 is the 7093635-th centered octagonal number.

It is an amenable number.

201278601678361 is a deficient number, since it is larger than the sum of its proper divisors (14187270).

201278601678361 is an frugal number, since it uses more digits than its factorization.

201278601678361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28374538 (or 14187269 counting only the distinct ones).

The product of its (nonzero) digits is 8128512, while the sum is 58.

The spelling of 201278601678361 in words is "two hundred one trillion, two hundred seventy-eight billion, six hundred one million, six hundred seventy-eight thousand, three hundred sixty-one".