51624521666 has 16 divisors (see below), whose sum is σ = 79092080640. Its totient is φ = 25260601920.

The previous prime is 51624521647. The next prime is 51624521677. The reversal of 51624521666 is 66612542615.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1281215 + ... + 1320893.

It is an arithmetic number, because the mean of its divisors is an integer number (4943255040).

Almost surely, 2^51624521666 is an apocalyptic number.

51624521666 is a deficient number, since it is larger than the sum of its proper divisors (27467558974).

51624521666 is a wasteful number, since it uses less digits than its factorization.

51624521666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53569.

The product of its digits is 518400, while the sum is 44.

The spelling of 51624521666 in words is "fifty-one billion, six hundred twenty-four million, five hundred twenty-one thousand, six hundred sixty-six".