251155323552 has 192 divisors, whose sum is σ = 772057440000. Its totient is φ = 71458652160.

The previous prime is 251155323487. The next prime is 251155323553. The reversal of 251155323552 is 255323551152.

It is a self number, because there is not a number n which added to its sum of digits gives 251155323552.

It is not an unprimeable number, because it can be changed into a prime (251155323553) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7919824 + ... + 7951472.

It is an arithmetic number, because the mean of its divisors is an integer number (4021132500).

Almost surely, 2^251155323552 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 251155323552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (386028720000).

251155323552 is an abundant number, since it is smaller than the sum of its proper divisors (520902116448).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

251155323552 is a wasteful number, since it uses less digits than its factorization.

251155323552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31924 (or 31902 counting only the distinct ones).

The product of its digits is 225000, while the sum is 39.

The spelling of 251155323552 in words is "two hundred fifty-one billion, one hundred fifty-five million, three hundred twenty-three thousand, five hundred fifty-two".