51555024405 has 24 divisors (see below), whose sum is σ = 89372925720. Its totient is φ = 27492664320.

The previous prime is 51555024397. The next prime is 51555024421. The reversal of 51555024405 is 50442055515.

It can be written as a sum of positive squares in 4 ways, for example, as 1805060196 + 49749964209 = 42486^2 + 223047^2 .

It is not a de Polignac number, because 51555024405 - 2³ = 51555024397 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51555024405.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 328861 + ... + 459629.

It is an arithmetic number, because the mean of its divisors is an integer number (3723871905).

Almost surely, 2^51555024405 is an apocalyptic number.

It is an amenable number.

51555024405 is a deficient number, since it is larger than the sum of its proper divisors (37817901315).

51555024405 is a wasteful number, since it uses less digits than its factorization.

51555024405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139541 (or 139538 counting only the distinct ones).

The product of its (nonzero) digits is 100000, while the sum is 36.

The spelling of 51555024405 in words is "fifty-one billion, five hundred fifty-five million, twenty-four thousand, four hundred five".