18837021552 has 40 divisors (see below), whose sum is σ = 49460056080. Its totient is φ = 6176071680.

The previous prime is 18837021527. The next prime is 18837021557. The reversal of 18837021552 is 25512073881.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18837021557) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3213777 + ... + 3219632.

It is an arithmetic number, because the mean of its divisors is an integer number (1236501402).

Almost surely, 2^18837021552 is an apocalyptic number.

18837021552 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18837021552 is an abundant number, since it is smaller than the sum of its proper divisors (30623034528).

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

18837021552 is a wasteful number, since it uses less digits than its factorization.

18837021552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6433481 (or 6433475 counting only the distinct ones).

The product of its (nonzero) digits is 134400, while the sum is 42.

The spelling of 18837021552 in words is "eighteen billion, eight hundred thirty-seven million, twenty-one thousand, five hundred fifty-two".