51533245621 has 16 divisors (see below), whose sum is σ = 60707582208. Its totient is φ = 43126804800.

The previous prime is 51533245607. The next prime is 51533245627. The reversal of 51533245621 is 12654233515.

It is a cyclic number.

It is not a de Polignac number, because 51533245621 - 2⁹ = 51533245109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51533245627) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 438490 + ... + 543451.

It is an arithmetic number, because the mean of its divisors is an integer number (3794223888).

Almost surely, 2^51533245621 is an apocalyptic number.

It is an amenable number.

51533245621 is a deficient number, since it is larger than the sum of its proper divisors (9174336587).

51533245621 is a wasteful number, since it uses less digits than its factorization.

51533245621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 982332.

The product of its digits is 108000, while the sum is 37.

The spelling of 51533245621 in words is "fifty-one billion, five hundred thirty-three million, two hundred forty-five thousand, six hundred twenty-one".