51642463264 has 48 divisors (see below), whose sum is σ = 116908481088. Its totient is φ = 21996686592.

The previous prime is 51642463261. The next prime is 51642463283. The reversal of 51642463264 is 46236424615.

It is a self number, because there is not a number n which added to its sum of digits gives 51642463264.

It is not an unprimeable number, because it can be changed into a prime (51642463261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 670687 + ... + 743710.

It is an arithmetic number, because the mean of its divisors is an integer number (2435593356).

Almost surely, 2^51642463264 is an apocalyptic number.

It is an amenable number.

51642463264 is an abundant number, since it is smaller than the sum of its proper divisors (65266017824).

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

51642463264 is a wasteful number, since it uses less digits than its factorization.

51642463264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1414577 (or 1414569 counting only the distinct ones).

The product of its digits is 829440, while the sum is 43.

Adding to 51642463264 its reverse (46236424615), we get a palindrome (97878887879).

The spelling of 51642463264 in words is "fifty-one billion, six hundred forty-two million, four hundred sixty-three thousand, two hundred sixty-four".