61647166917 has 24 divisors (see below), whose sum is σ = 104248872000. Its totient is φ = 34367757120.

The previous prime is 61647166909. The next prime is 61647166957. The reversal of 61647166917 is 71966174616.

61647166917 is a `hidden beast` number, since 616 + 4 + 7 + 1 + 6 + 6 + 9 + 17 = 666.

It is not a de Polignac number, because 61647166917 - 2³ = 61647166909 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61647166957) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11930667 + ... + 11935832.

It is an arithmetic number, because the mean of its divisors is an integer number (4343703000).

Almost surely, 2^61647166917 is an apocalyptic number.

It is an amenable number.

61647166917 is a deficient number, since it is larger than the sum of its proper divisors (42601705083).

61647166917 is a wasteful number, since it uses less digits than its factorization.

61647166917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23866553 (or 23866550 counting only the distinct ones).

The product of its digits is 2286144, while the sum is 54.

The spelling of 61647166917 in words is "sixty-one billion, six hundred forty-seven million, one hundred sixty-six thousand, nine hundred seventeen".