51361952917490 has 16 divisors (see below), whose sum is σ = 93717974365848. Its totient is φ = 20263345808256.

The previous prime is 51361952917459. The next prime is 51361952917571. The reversal of 51361952917490 is 9471925916315.

It can be written as a sum of positive squares in 4 ways, for example, as 46110251945209 + 5251700972281 = 6790453^2 + 2291659^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35179419077 + ... + 35179420536.

Almost surely, 2^{51361952917490} is an apocalyptic number.

51361952917490 is a deficient number, since it is larger than the sum of its proper divisors (42356021448358).

51361952917490 is a wasteful number, since it uses less digits than its factorization.

51361952917490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70358839693.

The product of its (nonzero) digits is 18370800, while the sum is 62.

The spelling of 51361952917490 in words is "fifty-one trillion, three hundred sixty-one billion, nine hundred fifty-two million, nine hundred seventeen thousand, four hundred ninety".