18621970140 has 48 divisors (see below), whose sum is σ = 52291838592. Its totient is φ = 4951542336.

The previous prime is 18621970123. The next prime is 18621970189. The reversal of 18621970140 is 4107912681.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 426394 + ... + 468033.

It is an arithmetic number, because the mean of its divisors is an integer number (1089413304).

Almost surely, 2^18621970140 is an apocalyptic number.

18621970140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18621970140 is an abundant number, since it is smaller than the sum of its proper divisors (33669868452).

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

18621970140 is a wasteful number, since it uses less digits than its factorization.

18621970140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 894786 (or 894784 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 39.

The spelling of 18621970140 in words is "eighteen billion, six hundred twenty-one million, nine hundred seventy thousand, one hundred forty".