51613513711 has 4 divisors (see below), whose sum is σ = 51630378424. Its totient is φ = 51596649000.

The previous prime is 51613513639. The next prime is 51613513733. The reversal of 51613513711 is 11731531615.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51613513711 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 (51613513771) 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, 8427765 + ... + 8433886.

It is an arithmetic number, because the mean of its divisors is an integer number (12907594606).

Almost surely, 2^51613513711 is an apocalyptic number.

51613513711 is a deficient number, since it is larger than the sum of its proper divisors (16864713).

51613513711 is a wasteful number, since it uses less digits than its factorization.

51613513711 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16864712.

The product of its digits is 9450, while the sum is 34.

The spelling of 51613513711 in words is "fifty-one billion, six hundred thirteen million, five hundred thirteen thousand, seven hundred eleven".