51265420566 has 16 divisors (see below), whose sum is σ = 102543103488. Its totient is φ = 17086429800.

The previous prime is 51265420553. The next prime is 51265420573. The reversal of 51265420566 is 66502456215.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 456130 + ... + 557301.

It is an arithmetic number, because the mean of its divisors is an integer number (6408943968).

Almost surely, 2^51265420566 is an apocalyptic number.

51265420566 is an abundant number, since it is smaller than the sum of its proper divisors (51277682922).

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

51265420566 is a wasteful number, since it uses less digits than its factorization.

51265420566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1021867.

The product of its (nonzero) digits is 432000, while the sum is 42.

The spelling of 51265420566 in words is "fifty-one billion, two hundred sixty-five million, four hundred twenty thousand, five hundred sixty-six".