51365394577 has 4 divisors (see below), whose sum is σ = 58703308096. Its totient is φ = 44027481060.

The previous prime is 51365394547. The next prime is 51365394581. The reversal of 51365394577 is 77549356315.

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 51365394577 - 2²⁷ = 51231176849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51365394547) 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, 3668956749 + ... + 3668956762.

It is an arithmetic number, because the mean of its divisors is an integer number (14675827024).

Almost surely, 2^51365394577 is an apocalyptic number.

It is an amenable number.

51365394577 is a deficient number, since it is larger than the sum of its proper divisors (7337913519).

51365394577 is an equidigital number, since it uses as much as digits as its factorization.

51365394577 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7337913518.

The product of its digits is 11907000, while the sum is 55.

The spelling of 51365394577 in words is "fifty-one billion, three hundred sixty-five million, three hundred ninety-four thousand, five hundred seventy-seven".