256902553373 has 4 divisors (see below), whose sum is σ = 265761262140. Its totient is φ = 248043844608.

The previous prime is 256902553367. The next prime is 256902553463. The reversal of 256902553373 is 373355209652.

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 200249985049 + 56652568324 = 447493^2 + 238018^2 .

It is a cyclic number.

It is not a de Polignac number, because 256902553373 - 2¹⁸ = 256902291229 is a prime.

It is a super-2 number, since 2×256902553373² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256902523373) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4429354340 + ... + 4429354397.

It is an arithmetic number, because the mean of its divisors is an integer number (66440315535).

Almost surely, 2^256902553373 is an apocalyptic number.

It is an amenable number.

256902553373 is a deficient number, since it is larger than the sum of its proper divisors (8858708767).

256902553373 is an equidigital number, since it uses as much as digits as its factorization.

256902553373 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8858708766.

The product of its (nonzero) digits is 5103000, while the sum is 50.

The spelling of 256902553373 in words is "two hundred fifty-six billion, nine hundred two million, five hundred fifty-three thousand, three hundred seventy-three".