51318126261 has 16 divisors (see below), whose sum is σ = 77161585600. Its totient is φ = 33701454864.

The previous prime is 51318126257. The next prime is 51318126289. The reversal of 51318126261 is 16262181315.

51318126261 is a `hidden beast` number, since 5 + 1 + 3 + 18 + 12 + 626 + 1 = 666.

It is not a de Polignac number, because 51318126261 - 2² = 51318126257 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51318126221) 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, 14182306 + ... + 14185923.

It is an arithmetic number, because the mean of its divisors is an integer number (4822599100).

Almost surely, 2^51318126261 is an apocalyptic number.

It is an amenable number.

51318126261 is a deficient number, since it is larger than the sum of its proper divisors (25843459339).

51318126261 is a wasteful number, since it uses less digits than its factorization.

51318126261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28368305 (or 28368299 counting only the distinct ones).

The product of its digits is 17280, while the sum is 36.

The spelling of 51318126261 in words is "fifty-one billion, three hundred eighteen million, one hundred twenty-six thousand, two hundred sixty-one".