51320311515 has 48 divisors (see below), whose sum is σ = 99408962016. Its totient is φ = 24275673600.

The previous prime is 51320311481. The next prime is 51320311541. The reversal of 51320311515 is 51511302315.

51320311515 is a `hidden beast` number, since 5 + 132 + 0 + 3 + 11 + 515 = 666.

It is not a de Polignac number, because 51320311515 - 2⁶ = 51320311451 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1244064 + ... + 1284653.

It is an arithmetic number, because the mean of its divisors is an integer number (2071020042).

Almost surely, 2^51320311515 is an apocalyptic number.

51320311515 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

51320311515 is a deficient number, since it is larger than the sum of its proper divisors (48088650501).

51320311515 is a wasteful number, since it uses less digits than its factorization.

51320311515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2528780 (or 2528777 counting only the distinct ones).

The product of its (nonzero) digits is 2250, while the sum is 27.

The spelling of 51320311515 in words is "fifty-one billion, three hundred twenty million, three hundred eleven thousand, five hundred fifteen".