18520154556 has 24 divisors (see below), whose sum is σ = 43223223120. Its totient is φ = 6172023552.

The previous prime is 18520154491. The next prime is 18520154561. The reversal of 18520154556 is 65545102581.

It is a super-2 number, since 2×18520154556² (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 7 ways as a sum of consecutive naturals, for example, 112701 + ... + 223028.

It is an arithmetic number, because the mean of its divisors is an integer number (1800967630).

Almost surely, 2^18520154556 is an apocalyptic number.

It is an amenable number.

18520154556 is an abundant number, since it is smaller than the sum of its proper divisors (24703068564).

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

18520154556 is a wasteful number, since it uses less digits than its factorization.

18520154556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340333 (or 340331 counting only the distinct ones).

The product of its (nonzero) digits is 240000, while the sum is 42.

The spelling of 18520154556 in words is "eighteen billion, five hundred twenty million, one hundred fifty-four thousand, five hundred fifty-six".