100645868820 has 96 divisors (see below), whose sum is σ = 336069715968. Its totient is φ = 22004560512.

The previous prime is 100645868809. The next prime is 100645868831. The reversal of 100645868820 is 28868546001.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (100645868809) and next prime (100645868831).

It is a self number, because there is not a number n which added to its sum of digits gives 100645868820.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5199754 + ... + 5219073.

It is an arithmetic number, because the mean of its divisors is an integer number (3500726208).

Almost surely, 2^100645868820 is an apocalyptic number.

100645868820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

100645868820 is an abundant number, since it is smaller than the sum of its proper divisors (235423847148).

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

100645868820 is a wasteful number, since it uses less digits than its factorization.

100645868820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10418869 (or 10418867 counting only the distinct ones).

The product of its (nonzero) digits is 737280, while the sum is 48.

The spelling of 100645868820 in words is "one hundred billion, six hundred forty-five million, eight hundred sixty-eight thousand, eight hundred twenty".