18657601643 has 8 divisors (see below), whose sum is σ = 19824918768. Its totient is φ = 17498041344.

The previous prime is 18657601631. The next prime is 18657601657. The reversal of 18657601643 is 34610675681.

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

It is a cyclic number.

It is not a de Polignac number, because 18657601643 - 2⁶ = 18657601579 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18657601693) 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, 1934246 + ... + 1943867.

It is an arithmetic number, because the mean of its divisors is an integer number (2478114846).

Almost surely, 2^18657601643 is an apocalyptic number.

18657601643 is a deficient number, since it is larger than the sum of its proper divisors (1167317125).

18657601643 is a wasteful number, since it uses less digits than its factorization.

18657601643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3878413.

The product of its (nonzero) digits is 725760, while the sum is 47.

The spelling of 18657601643 in words is "eighteen billion, six hundred fifty-seven million, six hundred one thousand, six hundred forty-three".