101997171639 has 48 divisors (see below), whose sum is σ = 163532079360. Its totient is φ = 60737080320.

The previous prime is 101997171607. The next prime is 101997171649. The reversal of 101997171639 is 936171799101.

It is not a de Polignac number, because 101997171639 - 2⁵ = 101997171607 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101997171649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 16077102 + ... + 16083444.

It is an arithmetic number, because the mean of its divisors is an integer number (3406918320).

Almost surely, 2^101997171639 is an apocalyptic number.

101997171639 is a deficient number, since it is larger than the sum of its proper divisors (61534907721).

101997171639 is a wasteful number, since it uses less digits than its factorization.

101997171639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9172 (or 9169 counting only the distinct ones).

The product of its (nonzero) digits is 642978, while the sum is 54.

The spelling of 101997171639 in words is "one hundred one billion, nine hundred ninety-seven million, one hundred seventy-one thousand, six hundred thirty-nine".