51157812501 has 6 divisors (see below), whose sum is σ = 73894618070. Its totient is φ = 34105208328.

The previous prime is 51157812463. The next prime is 51157812523. The reversal of 51157812501 is 10521875115.

It can be written as a sum of positive squares in only one way, i.e., 42217920900 + 8939891601 = 205470^2 + 94551^2 .

It is not a de Polignac number, because 51157812501 - 2⁷ = 51157812373 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51157812301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2842100686 + ... + 2842100703.

Almost surely, 2^51157812501 is an apocalyptic number.

It is an amenable number.

51157812501 is a deficient number, since it is larger than the sum of its proper divisors (22736805569).

51157812501 is a wasteful number, since it uses less digits than its factorization.

51157812501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5684201395 (or 5684201392 counting only the distinct ones).

The product of its (nonzero) digits is 14000, while the sum is 36.

It can be divided in two parts, 5115 and 7812501, that added together give a square (7817616 = 2796²).

The spelling of 51157812501 in words is "fifty-one billion, one hundred fifty-seven million, eight hundred twelve thousand, five hundred one".