117648661 has 16 divisors (see below), whose sum is σ = 130281984. Its totient is φ = 105560064.

The previous prime is 117648649. The next prime is 117648667. The reversal of 117648661 is 166846711.

It is a cyclic number.

It is not a de Polignac number, because 117648661 - 2⁹ = 117648149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (117648667) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 101461 + ... + 102613.

It is an arithmetic number, because the mean of its divisors is an integer number (8142624).

Almost surely, 2^117648661 is an apocalyptic number.

It is an amenable number.

117648661 is a deficient number, since it is larger than the sum of its proper divisors (12633323).

117648661 is a wasteful number, since it uses less digits than its factorization.

117648661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1380.

The product of its digits is 48384, while the sum is 40.

The square root of 117648661 is about 10846.5967473674. The cubic root of 117648661 is about 489.9995293623. Note that the first 3 decimals are identical.

The spelling of 117648661 in words is "one hundred seventeen million, six hundred forty-eight thousand, six hundred sixty-one".