251516540390 has 16 divisors (see below), whose sum is σ = 460403159760. Its totient is φ = 98901419040.

The previous prime is 251516540383. The next prime is 251516540423. The reversal of 251516540390 is 93045615152.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 213149021 + ... + 213150200.

It is an arithmetic number, because the mean of its divisors is an integer number (28775197485).

Almost surely, 2^251516540390 is an apocalyptic number.

251516540390 is a deficient number, since it is larger than the sum of its proper divisors (208886619370).

251516540390 is a wasteful number, since it uses less digits than its factorization.

251516540390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 426299287.

The product of its (nonzero) digits is 162000, while the sum is 41.

The spelling of 251516540390 in words is "two hundred fifty-one billion, five hundred sixteen million, five hundred forty thousand, three hundred ninety".