51451994952 has 24 divisors (see below), whose sum is σ = 139349153190. Its totient is φ = 17150664960.

The previous prime is 51451994939. The next prime is 51451994953. The reversal of 51451994952 is 25949915415.

It is a happy number.

51451994952 is a `hidden beast` number, since 5 + 14 + 51 + 99 + 495 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 30734998596 + 20716996356 = 175314^2 + 143934^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is not an unprimeable number, because it can be changed into a prime (51451994953) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 357305449 + ... + 357305592.

Almost surely, 2^51451994952 is an apocalyptic number.

It is an amenable number.

51451994952 is an abundant number, since it is smaller than the sum of its proper divisors (87897158238).

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

51451994952 is a wasteful number, since it uses less digits than its factorization.

51451994952 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 714611053 (or 714611046 counting only the distinct ones).

The product of its digits is 2916000, while the sum is 54.

The spelling of 51451994952 in words is "fifty-one billion, four hundred fifty-one million, nine hundred ninety-four thousand, nine hundred fifty-two".