18661477862380 has 48 divisors (see below), whose sum is σ = 39628296126720. Its totient is φ = 7381363320000.

The previous prime is 18661477862347. The next prime is 18661477862471. The reversal of 18661477862380 is 8326877416681.

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, 12674256 + ... + 14069815.

It is an arithmetic number, because the mean of its divisors is an integer number (825589502640).

Almost surely, 2^{18661477862380} is an apocalyptic number.

18661477862380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18661477862380 is an abundant number, since it is smaller than the sum of its proper divisors (20966818264340).

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

18661477862380 is a wasteful number, since it uses less digits than its factorization.

18661477862380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26744470 (or 26744468 counting only the distinct ones).

The product of its (nonzero) digits is 130056192, while the sum is 67.

The spelling of 18661477862380 in words is "eighteen trillion, six hundred sixty-one billion, four hundred seventy-seven million, eight hundred sixty-two thousand, three hundred eighty".