18214909657 has 8 divisors (see below), whose sum is σ = 21534868800. Its totient is φ = 15074407824.

The previous prime is 18214909621. The next prime is 18214909663. The reversal of 18214909657 is 75690941281.

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

It is a de Polignac number, because none of the positive numbers 2^k-18214909657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18214909357) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44864107 + ... + 44864512.

It is an arithmetic number, because the mean of its divisors is an integer number (2691858600).

Almost surely, 2^18214909657 is an apocalyptic number.

It is an amenable number.

18214909657 is a deficient number, since it is larger than the sum of its proper divisors (3319959143).

18214909657 is an equidigital number, since it uses as much as digits as its factorization.

18214909657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89728655.

The product of its (nonzero) digits is 1088640, while the sum is 52.

The spelling of 18214909657 in words is "eighteen billion, two hundred fourteen million, nine hundred nine thousand, six hundred fifty-seven".