51505388715 has 32 divisors (see below), whose sum is σ = 91242130176. Its totient is φ = 24599583360.

The previous prime is 51505388687. The next prime is 51505388719. The reversal of 51505388715 is 51788350515.

It is not a de Polignac number, because 51505388715 - 2¹³ = 51505380523 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51505388719) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2318452 + ... + 2340561.

It is an arithmetic number, because the mean of its divisors is an integer number (2851316568).

Almost surely, 2^51505388715 is an apocalyptic number.

51505388715 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

51505388715 is a deficient number, since it is larger than the sum of its proper divisors (39736741461).

51505388715 is a wasteful number, since it uses less digits than its factorization.

51505388715 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4659099.

The product of its (nonzero) digits is 840000, while the sum is 48.

The spelling of 51505388715 in words is "fifty-one billion, five hundred five million, three hundred eighty-eight thousand, seven hundred fifteen".