51613255421 has 32 divisors (see below), whose sum is σ = 63799142400. Its totient is φ = 40660439040.

The previous prime is 51613255417. The next prime is 51613255427. The reversal of 51613255421 is 12455231615.

51613255421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 51613255421 - 2² = 51613255417 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51613255427) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 24801101 + ... + 24803181.

It is an arithmetic number, because the mean of its divisors is an integer number (1993723200).

Almost surely, 2^51613255421 is an apocalyptic number.

It is an amenable number.

51613255421 is a deficient number, since it is larger than the sum of its proper divisors (12185886979).

51613255421 is a wasteful number, since it uses less digits than its factorization.

51613255421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3149.

The product of its digits is 36000, while the sum is 35.

The spelling of 51613255421 in words is "fifty-one billion, six hundred thirteen million, two hundred fifty-five thousand, four hundred twenty-one".