18397690971 has 16 divisors (see below), whose sum is σ = 26952804480. Its totient is φ = 11069896320.

The previous prime is 18397690957. The next prime is 18397690979. The reversal of 18397690971 is 17909679381.

It is not a de Polignac number, because 18397690971 - 2¹⁷ = 18397559899 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18397690979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2000830 + ... + 2010003.

It is an arithmetic number, because the mean of its divisors is an integer number (1684550280).

Almost surely, 2^18397690971 is an apocalyptic number.

18397690971 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

18397690971 is a deficient number, since it is larger than the sum of its proper divisors (8555113509).

18397690971 is a wasteful number, since it uses less digits than its factorization.

18397690971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4010986.

The product of its (nonzero) digits is 5143824, while the sum is 60.

The spelling of 18397690971 in words is "eighteen billion, three hundred ninety-seven million, six hundred ninety thousand, nine hundred seventy-one".