18134521820 has 12 divisors (see below), whose sum is σ = 38082495864. Its totient is φ = 7253808720.

The previous prime is 18134521789. The next prime is 18134521849. The reversal of 18134521820 is 2812543181.

It is a super-2 number, since 2×18134521820² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 453363026 + ... + 453363065.

It is an arithmetic number, because the mean of its divisors is an integer number (3173541322).

Almost surely, 2^18134521820 is an apocalyptic number.

18134521820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18134521820 is an abundant number, since it is smaller than the sum of its proper divisors (19947974044).

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

18134521820 is a wasteful number, since it uses less digits than its factorization.

18134521820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 906726100 (or 906726098 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 35.

The spelling of 18134521820 in words is "eighteen billion, one hundred thirty-four million, five hundred twenty-one thousand, eight hundred twenty".