256222052551 has 4 divisors (see below), whose sum is σ = 261673585632. Its totient is φ = 250770519472.

The previous prime is 256222052533. The next prime is 256222052573. The reversal of 256222052551 is 155250222652.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 256222052551 - 2²⁹ = 255685181639 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 256222052551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256222052501) 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, 2725766470 + ... + 2725766563.

It is an arithmetic number, because the mean of its divisors is an integer number (65418396408).

Almost surely, 2^256222052551 is an apocalyptic number.

256222052551 is a deficient number, since it is larger than the sum of its proper divisors (5451533081).

256222052551 is an equidigital number, since it uses as much as digits as its factorization.

256222052551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5451533080.

The product of its (nonzero) digits is 120000, while the sum is 37.

The spelling of 256222052551 in words is "two hundred fifty-six billion, two hundred twenty-two million, fifty-two thousand, five hundred fifty-one".