361638001666369 has 4 divisors (see below), whose sum is σ = 371412001711444. Its totient is φ = 351864001621296.

The previous prime is 361638001666313. The next prime is 361638001666393. The reversal of 361638001666369 is 963666100836163.

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 338236237440000 + 23401764226369 = 18391200^2 + 4837537^2 .

It is a cyclic number.

It is not a de Polignac number, because 361638001666369 - 2²⁹ = 361637464795457 is a prime.

It is a super-2 number, since 2×361638001666369² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 361638001666369.

It is not an unprimeable number, because it can be changed into a prime (361638001661369) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4887000022482 + ... + 4887000022555.

It is an arithmetic number, because the mean of its divisors is an integer number (92853000427861).

Almost surely, 2^{361638001666369} is an apocalyptic number.

It is an amenable number.

361638001666369 is a deficient number, since it is larger than the sum of its proper divisors (9774000045075).

361638001666369 is an equidigital number, since it uses as much as digits as its factorization.

361638001666369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9774000045074.

The product of its (nonzero) digits is 90699264, while the sum is 64.

The spelling of 361638001666369 in words is "three hundred sixty-one trillion, six hundred thirty-eight billion, one million, six hundred sixty-six thousand, three hundred sixty-nine".