256752161646 has 16 divisors (see below), whose sum is σ = 513616228608. Its totient is φ = 85565403000.

The previous prime is 256752161623. The next prime is 256752161647. The reversal of 256752161646 is 646161257652.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256752161647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4632880 + ... + 4687971.

It is an arithmetic number, because the mean of its divisors is an integer number (32101014288).

Almost surely, 2^256752161646 is an apocalyptic number.

256752161646 is an abundant number, since it is smaller than the sum of its proper divisors (256864066962).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

256752161646 is a wasteful number, since it uses less digits than its factorization.

256752161646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9325447.

The product of its digits is 3628800, while the sum is 51.

The spelling of 256752161646 in words is "two hundred fifty-six billion, seven hundred fifty-two million, one hundred sixty-one thousand, six hundred forty-six".