51020515666 has 8 divisors (see below), whose sum is σ = 78999508224. Its totient is φ = 24687346260.

The previous prime is 51020515657. The next prime is 51020515691. The reversal of 51020515666 is 66651502015.

It is a sphenic number, since it is the product of 3 distinct primes.

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 3 ways as a sum of consecutive naturals, for example, 411455710 + ... + 411455833.

It is an arithmetic number, because the mean of its divisors is an integer number (9874938528).

Almost surely, 2^51020515666 is an apocalyptic number.

51020515666 is a deficient number, since it is larger than the sum of its proper divisors (27978992558).

51020515666 is a wasteful number, since it uses less digits than its factorization.

51020515666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 822911576.

The product of its (nonzero) digits is 54000, while the sum is 37.

The spelling of 51020515666 in words is "fifty-one billion, twenty million, five hundred fifteen thousand, six hundred sixty-six".