18397932211890 has 96 divisors (see below), whose sum is σ = 59637972491136. Its totient is φ = 3822946951680.

The previous prime is 18397932211873. The next prime is 18397932211913. The reversal of 18397932211890 is 9811223979381.

18397932211890 is a `hidden beast` number, since 1 + 8 + 397 + 9 + 3 + 221 + 18 + 9 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1327405207 + ... + 1327419066.

It is an arithmetic number, because the mean of its divisors is an integer number (621228880116).

Almost surely, 2^{18397932211890} is an apocalyptic number.

18397932211890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18397932211890 is an abundant number, since it is smaller than the sum of its proper divisors (41240040279246).

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

18397932211890 is a wasteful number, since it uses less digits than its factorization.

18397932211890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2654824304 (or 2654824301 counting only the distinct ones).

The product of its (nonzero) digits is 11757312, while the sum is 63.

The spelling of 18397932211890 in words is "eighteen trillion, three hundred ninety-seven billion, nine hundred thirty-two million, two hundred eleven thousand, eight hundred ninety".