51655004421 has 8 divisors (see below), whose sum is σ = 71248282080. Its totient is φ = 33249198192.

The previous prime is 51655004413. The next prime is 51655004447. The reversal of 51655004421 is 12440055615.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 51655004421 - 2³ = 51655004413 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 (51655004021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 296867755 + ... + 296867928.

It is an arithmetic number, because the mean of its divisors is an integer number (8906035260).

Almost surely, 2^51655004421 is an apocalyptic number.

It is an amenable number.

51655004421 is a deficient number, since it is larger than the sum of its proper divisors (19593277659).

51655004421 is a wasteful number, since it uses less digits than its factorization.

51655004421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 593735715.

The product of its (nonzero) digits is 24000, while the sum is 33.

The spelling of 51655004421 in words is "fifty-one billion, six hundred fifty-five million, four thousand, four hundred twenty-one".