51571821575 has 12 divisors (see below), whose sum is σ = 66154199640. Its totient is φ = 39834785760.

The previous prime is 51571821563. The next prime is 51571821583. The reversal of 51571821575 is 57512817515.

It is not a de Polignac number, because 51571821575 - 2⁴ = 51571821559 is a prime.

It is a hoax number, since the sum of its digits (47) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 35566049 + ... + 35567498.

It is an arithmetic number, because the mean of its divisors is an integer number (5512849970).

Almost surely, 2^51571821575 is an apocalyptic number.

51571821575 is a deficient number, since it is larger than the sum of its proper divisors (14582378065).

51571821575 is a wasteful number, since it uses less digits than its factorization.

51571821575 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71133586 (or 71133581 counting only the distinct ones).

The product of its digits is 490000, while the sum is 47.

The spelling of 51571821575 in words is "fifty-one billion, five hundred seventy-one million, eight hundred twenty-one thousand, five hundred seventy-five".