255722759021 has 4 divisors (see below), whose sum is σ = 266841139872. Its totient is φ = 244604378172.

The previous prime is 255722759011. The next prime is 255722759027. The reversal of 255722759021 is 120957227552.

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 not a de Polignac number, because 255722759021 - 2⁶ = 255722758957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255722759027) 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, 5559190391 + ... + 5559190436.

It is an arithmetic number, because the mean of its divisors is an integer number (66710284968).

Almost surely, 2^255722759021 is an apocalyptic number.

It is an amenable number.

255722759021 is a deficient number, since it is larger than the sum of its proper divisors (11118380851).

255722759021 is a wasteful number, since it uses less digits than its factorization.

255722759021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11118380850.

The product of its (nonzero) digits is 882000, while the sum is 47.

The spelling of 255722759021 in words is "two hundred fifty-five billion, seven hundred twenty-two million, seven hundred fifty-nine thousand, twenty-one".