61509789988 has 12 divisors (see below), whose sum is σ = 107653719040. Its totient is φ = 30751584552.

The previous prime is 61509789983. The next prime is 61509790003. The reversal of 61509789988 is 88998790516.

It is not an unprimeable number, because it can be changed into a prime (61509789983) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 785568 + ... + 860311.

Almost surely, 2^61509789988 is an apocalyptic number.

It is an amenable number.

61509789988 is a deficient number, since it is larger than the sum of its proper divisors (46143929052).

61509789988 is a wasteful number, since it uses less digits than its factorization.

61509789988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1655226 (or 1655224 counting only the distinct ones).

The product of its (nonzero) digits is 78382080, while the sum is 70.

The spelling of 61509789988 in words is "sixty-one billion, five hundred nine million, seven hundred eighty-nine thousand, nine hundred eighty-eight".