18645952900 has 36 divisors (see below), whose sum is σ = 41147522640. Its totient is φ = 7331965600.

The previous prime is 18645952891. The next prime is 18645952909. The reversal of 18645952900 is 925954681.

It is an interprime number because it is at equal distance from previous prime (18645952891) and next prime (18645952909).

It is not an unprimeable number, because it can be changed into a prime (18645952909) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1574266 + ... + 1586065.

It is an arithmetic number, because the mean of its divisors is an integer number (1142986740).

Almost surely, 2^18645952900 is an apocalyptic number.

18645952900 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18645952900 is an abundant number, since it is smaller than the sum of its proper divisors (22501569740).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18645952900 is a wasteful number, since it uses less digits than its factorization.

18645952900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3160404 (or 3160397 counting only the distinct ones).

The product of its (nonzero) digits is 777600, while the sum is 49.

The spelling of 18645952900 in words is "eighteen billion, six hundred forty-five million, nine hundred fifty-two thousand, nine hundred".