18237021630 has 32 divisors (see below), whose sum is σ = 44021863584. Its totient is φ = 4835093376.

The previous prime is 18237021613. The next prime is 18237021631. The reversal of 18237021630 is 3612073281.

It is a junction number, because it is equal to n+sod(n) for n = 18237021591 and 18237021600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18237021631) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1751749 + ... + 1762128.

It is an arithmetic number, because the mean of its divisors is an integer number (1375683237).

Almost surely, 2^18237021630 is an apocalyptic number.

18237021630 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18237021630 is an abundant number, since it is smaller than the sum of its proper divisors (25784841954).

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

18237021630 is a wasteful number, since it uses less digits than its factorization.

18237021630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3514060.

The product of its (nonzero) digits is 12096, while the sum is 33.

The spelling of 18237021630 in words is "eighteen billion, two hundred thirty-seven million, twenty-one thousand, six hundred thirty".