365638181820 has 24 divisors (see below), whose sum is σ = 1023786909264. Its totient is φ = 97503515136.

The previous prime is 365638181737. The next prime is 365638181849. The reversal of 365638181820 is 28181836563.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3046984789 + ... + 3046984908.

It is an arithmetic number, because the mean of its divisors is an integer number (42657787886).

Almost surely, 2^365638181820 is an apocalyptic number.

365638181820 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

365638181820 is an abundant number, since it is smaller than the sum of its proper divisors (658148727444).

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

365638181820 is a wasteful number, since it uses less digits than its factorization.

365638181820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6093969709 (or 6093969707 counting only the distinct ones).

The product of its (nonzero) digits is 1658880, while the sum is 51.

The spelling of 365638181820 in words is "three hundred sixty-five billion, six hundred thirty-eight million, one hundred eighty-one thousand, eight hundred twenty".