18652657661 has 8 divisors (see below), whose sum is σ = 20732285664. Its totient is φ = 16637018320.

The previous prime is 18652657649. The next prime is 18652657663. The reversal of 18652657661 is 16675625681.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18652657661 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (53).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18652657663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15996551 + ... + 15997716.

It is an arithmetic number, because the mean of its divisors is an integer number (2591535708).

Almost surely, 2^18652657661 is an apocalyptic number.

18652657661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

18652657661 is a deficient number, since it is larger than the sum of its proper divisors (2079628003).

18652657661 is a wasteful number, since it uses less digits than its factorization.

18652657661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31994331.

The product of its digits is 3628800, while the sum is 53.

The spelling of 18652657661 in words is "eighteen billion, six hundred fifty-two million, six hundred fifty-seven thousand, six hundred sixty-one".