51206475091969 has 4 divisors (see below), whose sum is σ = 52074381449520. Its totient is φ = 50338568734420.

The previous prime is 51206475091939. The next prime is 51206475091987. The reversal of 51206475091969 is 96919057460215.

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 51206475091969 - 2⁷ = 51206475091841 is a prime.

It is a super-2 number, since 2×51206475091969² (a number of 28 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 51206475091969.

It is not an unprimeable number, because it can be changed into a prime (51206475091939) 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, 433953178687 + ... + 433953178804.

It is an arithmetic number, because the mean of its divisors is an integer number (13018595362380).

Almost surely, 2^{51206475091969} is an apocalyptic number.

51206475091969 is a gapful number since it is divisible by the number (59) formed by its first and last digit.

It is an amenable number.

51206475091969 is a deficient number, since it is larger than the sum of its proper divisors (867906357551).

51206475091969 is an equidigital number, since it uses as much as digits as its factorization.

51206475091969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 867906357550.

The product of its (nonzero) digits is 36741600, while the sum is 64.

The spelling of 51206475091969 in words is "fifty-one trillion, two hundred six billion, four hundred seventy-five million, ninety-one thousand, nine hundred sixty-nine".