51013605621 has 16 divisors (see below), whose sum is σ = 76760285760. Its totient is φ = 29851221120.

The previous prime is 51013605613. The next prime is 51013605631. The reversal of 51013605621 is 12650631015.

It is not a de Polignac number, because 51013605621 - 2³ = 51013605613 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51013605631) 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, 26651920 + ... + 26653833.

It is an arithmetic number, because the mean of its divisors is an integer number (4797517860).

Almost surely, 2^51013605621 is an apocalyptic number.

It is an amenable number.

51013605621 is a deficient number, since it is larger than the sum of its proper divisors (25746680139).

51013605621 is a wasteful number, since it uses less digits than its factorization.

51013605621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53305796.

The product of its (nonzero) digits is 5400, while the sum is 30.

The spelling of 51013605621 in words is "fifty-one billion, thirteen million, six hundred five thousand, six hundred twenty-one".