64117400661 has 32 divisors (see below), whose sum is σ = 96379470720. Its totient is φ = 42120196992.

The previous prime is 64117400653. The next prime is 64117400671. The reversal of 64117400661 is 16600471146.

It is a happy number.

64117400661 is a `hidden beast` number, since 641 + 1 + 7 + 4 + 0 + 0 + 6 + 6 + 1 = 666.

It is not a de Polignac number, because 64117400661 - 2³ = 64117400653 is a prime.

It is a super-2 number, since 2×64117400661² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64117400671) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2187046 + ... + 2216168.

It is an arithmetic number, because the mean of its divisors is an integer number (3011858460).

Almost surely, 2^64117400661 is an apocalyptic number.

It is an amenable number.

64117400661 is a deficient number, since it is larger than the sum of its proper divisors (32262070059).

64117400661 is a wasteful number, since it uses less digits than its factorization.

64117400661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30322 (or 30316 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The spelling of 64117400661 in words is "sixty-four billion, one hundred seventeen million, four hundred thousand, six hundred sixty-one".