51566550615 has 32 divisors (see below), whose sum is σ = 91722248640. Its totient is φ = 27487646208.

The previous prime is 51566550611. The next prime is 51566550697. The reversal of 51566550615 is 51605566515.

It is not a de Polignac number, because 51566550615 - 2² = 51566550611 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51566550611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 158419 + ... + 358091.

It is an arithmetic number, because the mean of its divisors is an integer number (2866320270).

Almost surely, 2^51566550615 is an apocalyptic number.

51566550615 is a deficient number, since it is larger than the sum of its proper divisors (40155698025).

51566550615 is a wasteful number, since it uses less digits than its factorization.

51566550615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201600 (or 201594 counting only the distinct ones).

The product of its (nonzero) digits is 675000, while the sum is 45.

The spelling of 51566550615 in words is "fifty-one billion, five hundred sixty-six million, five hundred fifty thousand, six hundred fifteen".