251280081378 has 24 divisors (see below), whose sum is σ = 544564168668. Its totient is φ = 83740951392.

The previous prime is 251280081361. The next prime is 251280081401. The reversal of 251280081378 is 873180082152.

251280081378 is a `hidden beast` number, since 251 + 28 + 0 + 0 + 8 + 1 + 378 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 250073005329 + 1207076049 = 500073^2 + 34743^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1508301 + ... + 1666592.

Almost surely, 2^251280081378 is an apocalyptic number.

251280081378 is an abundant number, since it is smaller than the sum of its proper divisors (293284087290).

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

251280081378 is a wasteful number, since it uses less digits than its factorization.

251280081378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3179298 (or 3179295 counting only the distinct ones).

The product of its (nonzero) digits is 215040, while the sum is 45.

The spelling of 251280081378 in words is "two hundred fifty-one billion, two hundred eighty million, eighty-one thousand, three hundred seventy-eight".