51451636264 has 64 divisors (see below), whose sum is σ = 116640000000. Its totient is φ = 20785076928.

The previous prime is 51451636259. The next prime is 51451636333. The reversal of 51451636264 is 46263615415.

51451636264 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 51451636264.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 90237 + ... + 333235.

It is an arithmetic number, because the mean of its divisors is an integer number (1822500000).

Almost surely, 2^51451636264 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51451636264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (58320000000).

51451636264 is an abundant number, since it is smaller than the sum of its proper divisors (65188363736).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51451636264 is a wasteful number, since it uses less digits than its factorization.

51451636264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243230 (or 243226 counting only the distinct ones).

The product of its digits is 518400, while the sum is 43.

The spelling of 51451636264 in words is "fifty-one billion, four hundred fifty-one million, six hundred thirty-six thousand, two hundred sixty-four".