51249953511 has 12 divisors (see below), whose sum is σ = 74034789192. Its totient is φ = 34163368656.

The previous prime is 51249953497. The next prime is 51249953519. The reversal of 51249953511 is 11535994215.

51249953511 is a `hidden beast` number, since 5 + 1 + 2 + 49 + 95 + 3 + 511 = 666.

It is not a de Polignac number, because 51249953511 - 2⁵ = 51249953479 is a prime.

It is a super-2 number, since 2×51249953511² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51249953519) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 170916 + ... + 362921.

It is an arithmetic number, because the mean of its divisors is an integer number (6169565766).

Almost surely, 2^51249953511 is an apocalyptic number.

51249953511 is a deficient number, since it is larger than the sum of its proper divisors (22784835681).

51249953511 is a wasteful number, since it uses less digits than its factorization.

51249953511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 544510 (or 544507 counting only the distinct ones).

The product of its digits is 243000, while the sum is 45.

The spelling of 51249953511 in words is "fifty-one billion, two hundred forty-nine million, nine hundred fifty-three thousand, five hundred eleven".