18640621417 has 8 divisors (see below), whose sum is σ = 20336595552. Its totient is φ = 16944876000.

The previous prime is 18640621399. The next prime is 18640621453. The reversal of 18640621417 is 71412604681.

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-18640621417 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18640621417.

It is not an unprimeable number, because it can be changed into a prime (18640921417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 144042 + ... + 240892.

It is an arithmetic number, because the mean of its divisors is an integer number (2542074444).

Almost surely, 2^18640621417 is an apocalyptic number.

It is an amenable number.

18640621417 is a deficient number, since it is larger than the sum of its proper divisors (1695974135).

18640621417 is a wasteful number, since it uses less digits than its factorization.

18640621417 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114359.

The product of its (nonzero) digits is 64512, while the sum is 40.

The spelling of 18640621417 in words is "eighteen billion, six hundred forty million, six hundred twenty-one thousand, four hundred seventeen".