51921936448263 has 384 divisors, whose sum is σ = 97667057664000. Its totient is φ = 27093412604160.

The previous prime is 51921936448253. The next prime is 51921936448289. The reversal of 51921936448263 is 36284463912915.

It is a happy number.

51921936448263 is a `hidden beast` number, since 5 + 1 + 9 + 2 + 1 + 9 + 364 + 4 + 8 + 263 = 666.

It is not a de Polignac number, because 51921936448263 - 2⁶ = 51921936448199 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a self number, because there is not a number n which added to its sum of digits gives 51921936448263.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51921936448253) by changing a digit.

It is a polite number, since it can be written in 383 ways as a sum of consecutive naturals, for example, 20743880670 + ... + 20743883172.

It is an arithmetic number, because the mean of its divisors is an integer number (254341296000).

Almost surely, 2^{51921936448263} is an apocalyptic number.

51921936448263 is a deficient number, since it is larger than the sum of its proper divisors (45745121215737).

51921936448263 is a wasteful number, since it uses less digits than its factorization.

51921936448263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2872 (or 2859 counting only the distinct ones).

The product of its digits is 67184640, while the sum is 63.

The spelling of 51921936448263 in words is "fifty-one trillion, nine hundred twenty-one billion, nine hundred thirty-six million, four hundred forty-eight thousand, two hundred sixty-three".