51566511515 has 8 divisors (see below), whose sum is σ = 62066763888. Its totient is φ = 41128575840.

The previous prime is 51566511487. The next prime is 51566511539. The reversal of 51566511515 is 51511566515.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-51566511515 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15577352 + ... + 15580661.

It is an arithmetic number, because the mean of its divisors is an integer number (7758345486).

Almost surely, 2^51566511515 is an apocalyptic number.

51566511515 is a deficient number, since it is larger than the sum of its proper divisors (10500252373).

51566511515 is a wasteful number, since it uses less digits than its factorization.

51566511515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31158349.

The product of its digits is 112500, while the sum is 41.

The spelling of 51566511515 in words is "fifty-one billion, five hundred sixty-six million, five hundred eleven thousand, five hundred fifteen".