51502251987 has 24 divisors (see below), whose sum is σ = 75154985568. Its totient is φ = 33982992000.

The previous prime is 51502251949. The next prime is 51502251991. The reversal of 51502251987 is 78915220515.

51502251987 is a `hidden beast` number, since 5 + 1 + 50 + 2 + 2 + 519 + 87 = 666.

It is not a de Polignac number, because 51502251987 - 2⁶ = 51502251923 is a prime.

It is a super-3 number, since 3×51502251987³ (a number of 33 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (51502251917) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3139687 + ... + 3156047.

It is an arithmetic number, because the mean of its divisors is an integer number (3131457732).

Almost surely, 2^51502251987 is an apocalyptic number.

51502251987 is a deficient number, since it is larger than the sum of its proper divisors (23652733581).

51502251987 is a wasteful number, since it uses less digits than its factorization.

51502251987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19931 (or 19928 counting only the distinct ones).

The product of its (nonzero) digits is 252000, while the sum is 45.

It can be divided in two parts, 515022 and 51987, that added together give a square (567009 = 753²).

The spelling of 51502251987 in words is "fifty-one billion, five hundred two million, two hundred fifty-one thousand, nine hundred eighty-seven".