18642205407 has 8 divisors (see below), whose sum is σ = 28407170176. Its totient is φ = 10652688792.

The previous prime is 18642205399. The next prime is 18642205409. The reversal of 18642205407 is 70450224681.

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

It is not a de Polignac number, because 18642205407 - 2³ = 18642205399 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18642205409) 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, 443862013 + ... + 443862054.

It is an arithmetic number, because the mean of its divisors is an integer number (3550896272).

Almost surely, 2^18642205407 is an apocalyptic number.

18642205407 is a deficient number, since it is larger than the sum of its proper divisors (9764964769).

18642205407 is an equidigital number, since it uses as much as digits as its factorization.

18642205407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 887724077.

The product of its (nonzero) digits is 107520, while the sum is 39.

The spelling of 18642205407 in words is "eighteen billion, six hundred forty-two million, two hundred five thousand, four hundred seven".