351444640064561 has 4 divisors (see below), whose sum is σ = 351477525322752. Its totient is φ = 351411754806372.

The previous prime is 351444640064543. The next prime is 351444640064587. The reversal of 351444640064561 is 165460046444153.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 351444640064561 - 2³⁴ = 351427460195377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (351444640064461) 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, 16442613065 + ... + 16442634438.

It is an arithmetic number, because the mean of its divisors is an integer number (87869381330688).

Almost surely, 2^{351444640064561} is an apocalyptic number.

It is an amenable number.

351444640064561 is a deficient number, since it is larger than the sum of its proper divisors (32885258191).

351444640064561 is a wasteful number, since it uses less digits than its factorization.

351444640064561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32885258190.

The product of its (nonzero) digits is 16588800, while the sum is 53.

The spelling of 351444640064561 in words is "three hundred fifty-one trillion, four hundred forty-four billion, six hundred forty million, sixty-four thousand, five hundred sixty-one".