251401377740 has 48 divisors (see below), whose sum is σ = 557626295520. Its totient is φ = 94942702080.

The previous prime is 251401377739. The next prime is 251401377743. The reversal of 251401377740 is 47773104152.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (251401377743) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1017641 + ... + 1240320.

It is an arithmetic number, because the mean of its divisors is an integer number (11617214490).

Almost surely, 2^251401377740 is an apocalyptic number.

251401377740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

251401377740 is an abundant number, since it is smaller than the sum of its proper divisors (306224917780).

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

251401377740 is a wasteful number, since it uses less digits than its factorization.

251401377740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2258282 (or 2258280 counting only the distinct ones).

The product of its (nonzero) digits is 164640, while the sum is 41.

The spelling of 251401377740 in words is "two hundred fifty-one billion, four hundred one million, three hundred seventy-seven thousand, seven hundred forty".