18912642349 has 16 divisors (see below), whose sum is σ = 19647216000. Its totient is φ = 18183735360.

The previous prime is 18912642323. The next prime is 18912642383. The reversal of 18912642349 is 94324621981.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 18912642349 - 2²⁵ = 18879087917 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18912640349) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11330887 + ... + 11332555.

It is an arithmetic number, because the mean of its divisors is an integer number (1227951000).

Almost surely, 2^18912642349 is an apocalyptic number.

It is an amenable number.

18912642349 is a deficient number, since it is larger than the sum of its proper divisors (734573651).

18912642349 is a wasteful number, since it uses less digits than its factorization.

18912642349 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3108.

The product of its digits is 746496, while the sum is 49.

The spelling of 18912642349 in words is "eighteen billion, nine hundred twelve million, six hundred forty-two thousand, three hundred forty-nine".