51335561772 has 72 divisors (see below), whose sum is σ = 141587584320. Its totient is φ = 15553386720.

The previous prime is 51335561747. The next prime is 51335561803. The reversal of 51335561772 is 27716553315.

51335561772 is a `hidden beast` number, since 5 + 13 + 3 + 5 + 561 + 7 + 72 = 666.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 3383379 + ... + 3398517.

Almost surely, 2^51335561772 is an apocalyptic number.

It is an amenable number.

51335561772 is an abundant number, since it is smaller than the sum of its proper divisors (90252022548).

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

51335561772 is a wasteful number, since it uses less digits than its factorization.

51335561772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23723 (or 23718 counting only the distinct ones).

The product of its digits is 661500, while the sum is 45.

The spelling of 51335561772 in words is "fifty-one billion, three hundred thirty-five million, five hundred sixty-one thousand, seven hundred seventy-two".