51554432465 has 4 divisors (see below), whose sum is σ = 61865318964. Its totient is φ = 41243545968.

The previous prime is 51554432393. The next prime is 51554432507. The reversal of 51554432465 is 56423445515.

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

It can be written as a sum of positive squares in 2 ways, for example, as 18575509264 + 32978923201 = 136292^2 + 181601^2 .

It is a cyclic number.

It is not a de Polignac number, because 51554432465 - 2¹² = 51554428369 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5155443242 + ... + 5155443251.

It is an arithmetic number, because the mean of its divisors is an integer number (15466329741).

Almost surely, 2^51554432465 is an apocalyptic number.

It is an amenable number.

51554432465 is a deficient number, since it is larger than the sum of its proper divisors (10310886499).

51554432465 is a wasteful number, since it uses less digits than its factorization.

51554432465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10310886498.

The product of its digits is 1440000, while the sum is 44.

The spelling of 51554432465 in words is "fifty-one billion, five hundred fifty-four million, four hundred thirty-two thousand, four hundred sixty-five".