51626928987 has 16 divisors (see below), whose sum is σ = 76592244000. Its totient is φ = 34369395552.

The previous prime is 51626928979. The next prime is 51626928989. The reversal of 51626928987 is 78982962615.

51626928987 is a `hidden beast` number, since 5 + 16 + 269 + 289 + 87 = 666.

It is not a de Polignac number, because 51626928987 - 2³ = 51626928979 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51626928989) 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 15 ways as a sum of consecutive naturals, for example, 1329312 + ... + 1367597.

It is an arithmetic number, because the mean of its divisors is an integer number (4787015250).

Almost surely, 2^51626928987 is an apocalyptic number.

51626928987 is a deficient number, since it is larger than the sum of its proper divisors (24965315013).

51626928987 is a wasteful number, since it uses less digits than its factorization.

51626928987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2697627 (or 2697621 counting only the distinct ones).

The product of its digits is 26127360, while the sum is 63.

The spelling of 51626928987 in words is "fifty-one billion, six hundred twenty-six million, nine hundred twenty-eight thousand, nine hundred eighty-seven".