51145031569 has 4 divisors (see below), whose sum is σ = 51147173440. Its totient is φ = 51142889700.

The previous prime is 51145031527. The next prime is 51145031629. The reversal of 51145031569 is 96513054115.

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 51145031569 - 2²³ = 51136642961 is a prime.

It is a super-2 number, since 2×51145031569² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51145031869) 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, 1034709 + ... + 1083010.

It is an arithmetic number, because the mean of its divisors is an integer number (12786793360).

Almost surely, 2^51145031569 is an apocalyptic number.

It is an amenable number.

51145031569 is a deficient number, since it is larger than the sum of its proper divisors (2141871).

51145031569 is a wasteful number, since it uses less digits than its factorization.

51145031569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2141870.

The product of its (nonzero) digits is 81000, while the sum is 40.

The spelling of 51145031569 in words is "fifty-one billion, one hundred forty-five million, thirty-one thousand, five hundred sixty-nine".