51375617029987 has 4 divisors (see below), whose sum is σ = 54397712149416. Its totient is φ = 48353521910560.

The previous prime is 51375617029981. The next prime is 51375617030009. The reversal of 51375617029987 is 78992071657315.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51375617029987 - 2¹⁹ = 51375616505699 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51375617029981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1511047559689 + ... + 1511047559722.

It is an arithmetic number, because the mean of its divisors is an integer number (13599428037354).

Almost surely, 2^{51375617029987} is an apocalyptic number.

51375617029987 is a deficient number, since it is larger than the sum of its proper divisors (3022095119429).

51375617029987 is a wasteful number, since it uses less digits than its factorization.

51375617029987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3022095119428.

The product of its (nonzero) digits is 200037600, while the sum is 70.

The spelling of 51375617029987 in words is "fifty-one trillion, three hundred seventy-five billion, six hundred seventeen million, twenty-nine thousand, nine hundred eighty-seven".