251420254555 has 8 divisors (see below), whose sum is σ = 309858476112. Its totient is φ = 195700089888.

The previous prime is 251420254549. The next prime is 251420254577. The reversal of 251420254555 is 555452024152.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 251420254555 - 2¹⁷ = 251420123483 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 679514017 + ... + 679514386.

It is an arithmetic number, because the mean of its divisors is an integer number (38732309514).

Almost surely, 2^251420254555 is an apocalyptic number.

251420254555 is a deficient number, since it is larger than the sum of its proper divisors (58438221557).

251420254555 is a wasteful number, since it uses less digits than its factorization.

251420254555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1359028445.

The product of its (nonzero) digits is 400000, while the sum is 40.

The spelling of 251420254555 in words is "two hundred fifty-one billion, four hundred twenty million, two hundred fifty-four thousand, five hundred fifty-five".