256502173773 has 16 divisors (see below), whose sum is σ = 349791077376. Its totient is φ = 167118016560.

The previous prime is 256502173769. The next prime is 256502173831. The reversal of 256502173773 is 377371205652.

256502173773 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 256502173773 - 2² = 256502173769 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256502173723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1235443 + ... + 1428048.

It is an arithmetic number, because the mean of its divisors is an integer number (21861942336).

Almost surely, 2^256502173773 is an apocalyptic number.

It is an amenable number.

256502173773 is a deficient number, since it is larger than the sum of its proper divisors (93288903603).

256502173773 is a wasteful number, since it uses less digits than its factorization.

256502173773 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2664224.

The product of its (nonzero) digits is 1852200, while the sum is 48.

The spelling of 256502173773 in words is "two hundred fifty-six billion, five hundred two million, one hundred seventy-three thousand, seven hundred seventy-three".