251126055378 has 64 divisors (see below), whose sum is σ = 609723676800. Its totient is φ = 75982150080.

The previous prime is 251126055377. The next prime is 251126055421. The reversal of 251126055378 is 873550621152.

251126055378 is a `hidden beast` number, since 2 + 5 + 1 + 1 + 2 + 605 + 5 + 37 + 8 = 666.

It is not an unprimeable number, because it can be changed into a prime (251126055373) 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, 64168 + ... + 711596.

It is an arithmetic number, because the mean of its divisors is an integer number (9526932450).

Almost surely, 2^251126055378 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 251126055378, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (304861838400).

251126055378 is an abundant number, since it is smaller than the sum of its proper divisors (358597621422).

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

251126055378 is a wasteful number, since it uses less digits than its factorization.

251126055378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 648104 (or 648098 counting only the distinct ones).

The product of its (nonzero) digits is 504000, while the sum is 45.

The spelling of 251126055378 in words is "two hundred fifty-one billion, one hundred twenty-six million, fifty-five thousand, three hundred seventy-eight".