256799993901 has 64 divisors (see below), whose sum is σ = 389722669056. Its totient is φ = 149000299200.

The previous prime is 256799993899. The next prime is 256799993929. The reversal of 256799993901 is 109399997652.

It is not a de Polignac number, because 256799993901 - 2¹ = 256799993899 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256799993941) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 116355940 + ... + 116358146.

It is an arithmetic number, because the mean of its divisors is an integer number (6089416704).

Almost surely, 2^256799993901 is an apocalyptic number.

It is an amenable number.

256799993901 is a deficient number, since it is larger than the sum of its proper divisors (132922675155).

256799993901 is a wasteful number, since it uses less digits than its factorization.

256799993901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3422.

The product of its (nonzero) digits is 74401740, while the sum is 69.

The spelling of 256799993901 in words is "two hundred fifty-six billion, seven hundred ninety-nine million, nine hundred ninety-three thousand, nine hundred one".