51135245656 has 24 divisors (see below), whose sum is σ = 105387207660. Its totient is φ = 23243293040.

The previous prime is 51135245639. The next prime is 51135245663. The reversal of 51135245656 is 65654253115.

It is a happy number.

It is a super-2 number, since 2×51135245656² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 26411866 + ... + 26413801.

Almost surely, 2^51135245656 is an apocalyptic number.

It is an amenable number.

51135245656 is an abundant number, since it is smaller than the sum of its proper divisors (54251962004).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51135245656 is a wasteful number, since it uses less digits than its factorization.

51135245656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52825695 (or 52825680 counting only the distinct ones).

The product of its digits is 540000, while the sum is 43.

The spelling of 51135245656 in words is "fifty-one billion, one hundred thirty-five million, two hundred forty-five thousand, six hundred fifty-six".