51545215251 has 6 divisors (see below), whose sum is σ = 74454199820. Its totient is φ = 34363476828.

The previous prime is 51545215219. The next prime is 51545215289. The reversal of 51545215251 is 15251254515.

51545215251 is a `hidden beast` number, since 5 + 1 + 5 + 452 + 152 + 51 = 666.

It is not a de Polignac number, because 51545215251 - 2⁵ = 51545215219 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51545210251) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2863623061 + ... + 2863623078.

Almost surely, 2^51545215251 is an apocalyptic number.

51545215251 is a deficient number, since it is larger than the sum of its proper divisors (22908984569).

51545215251 is a wasteful number, since it uses less digits than its factorization.

51545215251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5727246145 (or 5727246142 counting only the distinct ones).

The product of its digits is 50000, while the sum is 36.

Adding to 51545215251 its reverse (15251254515), we get a palindrome (66796469766).

The spelling of 51545215251 in words is "fifty-one billion, five hundred forty-five million, two hundred fifteen thousand, two hundred fifty-one".