51120658261 has 4 divisors (see below), whose sum is σ = 51385532332. Its totient is φ = 50855784192.

The previous prime is 51120658229. The next prime is 51120658271. The reversal of 51120658261 is 16285602115.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 32779102500 + 18341555761 = 181050^2 + 135431^2 .

It is a cyclic number.

It is not a de Polignac number, because 51120658261 - 2⁵ = 51120658229 is a prime.

It is a super-2 number, since 2×51120658261² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51120658261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51120658271) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 132436746 + ... + 132437131.

It is an arithmetic number, because the mean of its divisors is an integer number (12846383083).

Almost surely, 2^51120658261 is an apocalyptic number.

It is an amenable number.

51120658261 is a deficient number, since it is larger than the sum of its proper divisors (264874071).

51120658261 is a wasteful number, since it uses less digits than its factorization.

51120658261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 264874070.

The product of its (nonzero) digits is 28800, while the sum is 37.

The spelling of 51120658261 in words is "fifty-one billion, one hundred twenty million, six hundred fifty-eight thousand, two hundred sixty-one".