51003949864 has 24 divisors (see below), whose sum is σ = 111245860890. Its totient is φ = 21858835488.

The previous prime is 51003949823. The next prime is 51003949877. The reversal of 51003949864 is 46894930015.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 41408180100 + 9595769764 = 203490^2 + 97958^2 .

It is a Harshad number since it is a multiple of its sum of digits (49).

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 65055667 + ... + 65056450.

Almost surely, 2^51003949864 is an apocalyptic number.

It is an amenable number.

51003949864 is an abundant number, since it is smaller than the sum of its proper divisors (60241911026).

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

51003949864 is a wasteful number, since it uses less digits than its factorization.

51003949864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130112137 (or 130112126 counting only the distinct ones).

The product of its (nonzero) digits is 933120, while the sum is 49.

The spelling of 51003949864 in words is "fifty-one billion, three million, nine hundred forty-nine thousand, eight hundred sixty-four".