18718879650 has 24 divisors (see below), whose sum is σ = 46422821904. Its totient is φ = 4991701200.

The previous prime is 18718879649. The next prime is 18718879651. The reversal of 18718879650 is 5697881781.

It is an interprime number because it is at equal distance from previous prime (18718879649) and next prime (18718879651).

It is not an unprimeable number, because it can be changed into a prime (18718879651) 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, 62396116 + ... + 62396415.

It is an arithmetic number, because the mean of its divisors is an integer number (1934284246).

Almost surely, 2^18718879650 is an apocalyptic number.

18718879650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18718879650 is an abundant number, since it is smaller than the sum of its proper divisors (27703942254).

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

18718879650 is a wasteful number, since it uses less digits than its factorization.

18718879650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124792546 (or 124792541 counting only the distinct ones).

The product of its (nonzero) digits is 6773760, while the sum is 60.

The spelling of 18718879650 in words is "eighteen billion, seven hundred eighteen million, eight hundred seventy-nine thousand, six hundred fifty".