251215555040 has 48 divisors (see below), whose sum is σ = 593532152640. Its totient is φ = 100480227840.

The previous prime is 251215555039. The next prime is 251215555043. The reversal of 251215555040 is 40555512152.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251215555043) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3463466 + ... + 3535254.

It is an arithmetic number, because the mean of its divisors is an integer number (12365253180).

Almost surely, 2^251215555040 is an apocalyptic number.

251215555040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

251215555040 is an abundant number, since it is smaller than the sum of its proper divisors (342316597600).

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

251215555040 is a wasteful number, since it uses less digits than its factorization.

251215555040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93675 (or 93667 counting only the distinct ones).

The product of its (nonzero) digits is 50000, while the sum is 35.

The spelling of 251215555040 in words is "two hundred fifty-one billion, two hundred fifteen million, five hundred fifty-five thousand, forty".