51535700072 has 8 divisors (see below), whose sum is σ = 96629437650. Its totient is φ = 25767850032.

The previous prime is 51535700071. The next prime is 51535700089. The reversal of 51535700072 is 27000753515.

It can be written as a sum of positive squares in only one way, i.e., 51531724036 + 3976036 = 227006^2 + 1994^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×51535700072² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51535700071) 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 as a sum of consecutive naturals, namely, 3220981247 + ... + 3220981262.

Almost surely, 2^51535700072 is an apocalyptic number.

It is an amenable number.

51535700072 is a deficient number, since it is larger than the sum of its proper divisors (45093737578).

51535700072 is a wasteful number, since it uses less digits than its factorization.

51535700072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6441962515 (or 6441962511 counting only the distinct ones).

The product of its (nonzero) digits is 36750, while the sum is 35.

The spelling of 51535700072 in words is "fifty-one billion, five hundred thirty-five million, seven hundred thousand, seventy-two".