18875773665 has 96 divisors (see below), whose sum is σ = 38498803200. Its totient is φ = 8374689792.

The previous prime is 18875773661. The next prime is 18875773691. The reversal of 18875773665 is 56637757881.

It is not a de Polignac number, because 18875773665 - 2² = 18875773661 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (18875773661) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 5231292 + ... + 5234898.

It is an arithmetic number, because the mean of its divisors is an integer number (401029200).

Almost surely, 2^18875773665 is an apocalyptic number.

18875773665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18875773665 is an abundant number, since it is smaller than the sum of its proper divisors (19623029535).

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

18875773665 is a wasteful number, since it uses less digits than its factorization.

18875773665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4111 (or 4108 counting only the distinct ones).

The product of its digits is 59270400, while the sum is 63.

The spelling of 18875773665 in words is "eighteen billion, eight hundred seventy-five million, seven hundred seventy-three thousand, six hundred sixty-five".