51508792709 has 4 divisors (see below), whose sum is σ = 56191410240. Its totient is φ = 46826175180.

The previous prime is 51508792651. The next prime is 51508792723. The reversal of 51508792709 is 90729780515.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 51508792709 - 2¹² = 51508788613 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 (51508792739) 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, 2341308749 + ... + 2341308770.

It is an arithmetic number, because the mean of its divisors is an integer number (14047852560).

Almost surely, 2^51508792709 is an apocalyptic number.

It is an amenable number.

51508792709 is a deficient number, since it is larger than the sum of its proper divisors (4682617531).

51508792709 is a wasteful number, since it uses less digits than its factorization.

51508792709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4682617530.

The product of its (nonzero) digits is 1587600, while the sum is 53.

The spelling of 51508792709 in words is "fifty-one billion, five hundred eight million, seven hundred ninety-two thousand, seven hundred nine".