61512987933 has 12 divisors (see below), whose sum is σ = 88912515328. Its totient is φ = 40980771720.

The previous prime is 61512987869. The next prime is 61512987953. The reversal of 61512987933 is 33978921516.

61512987933 is a `hidden beast` number, since 6 + 1 + 512 + 98 + 7 + 9 + 33 = 666.

It is not a de Polignac number, because 61512987933 - 2⁶ = 61512987869 is a prime.

It is a super-2 number, since 2×61512987933² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 61512987933.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61512987953) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2309935 + ... + 2336412.

Almost surely, 2^61512987933 is an apocalyptic number.

It is an amenable number.

61512987933 is a deficient number, since it is larger than the sum of its proper divisors (27399527395).

61512987933 is a wasteful number, since it uses less digits than its factorization.

61512987933 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4647824 (or 4647821 counting only the distinct ones).

The product of its digits is 2449440, while the sum is 54.

The spelling of 61512987933 in words is "sixty-one billion, five hundred twelve million, nine hundred eighty-seven thousand, nine hundred thirty-three".