201595279681 has 4 divisors (see below), whose sum is σ = 206512237764. Its totient is φ = 196678321600.

The previous prime is 201595279651. The next prime is 201595279687. The reversal of 201595279681 is 186972595102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 121859639056 + 79735640625 = 349084^2 + 282375^2 .

It is a cyclic number.

It is not a de Polignac number, because 201595279681 - 2¹³ = 201595271489 is a prime.

It is a super-2 number, since 2×201595279681² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201595279687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2458478980 + ... + 2458479061.

It is an arithmetic number, because the mean of its divisors is an integer number (51628059441).

Almost surely, 2^201595279681 is an apocalyptic number.

It is an amenable number.

201595279681 is a deficient number, since it is larger than the sum of its proper divisors (4916958083).

201595279681 is an equidigital number, since it uses as much as digits as its factorization.

201595279681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4916958082.

The product of its (nonzero) digits is 2721600, while the sum is 55.

The spelling of 201595279681 in words is "two hundred one billion, five hundred ninety-five million, two hundred seventy-nine thousand, six hundred eighty-one".