51212646556 has 6 divisors (see below), whose sum is σ = 89622131480. Its totient is φ = 25606323276.

The previous prime is 51212646547. The next prime is 51212646559. The reversal of 51212646556 is 65564621215.

It is a super-2 number, since 2×51212646556² (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 (51212646559) 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 as a sum of consecutive naturals, namely, 6401580816 + ... + 6401580823.

Almost surely, 2^51212646556 is an apocalyptic number.

It is an amenable number.

51212646556 is a deficient number, since it is larger than the sum of its proper divisors (38409484924).

51212646556 is a wasteful number, since it uses less digits than its factorization.

51212646556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12803161643 (or 12803161641 counting only the distinct ones).

The product of its digits is 432000, while the sum is 43.

The spelling of 51212646556 in words is "fifty-one billion, two hundred twelve million, six hundred forty-six thousand, five hundred fifty-six".