101621666205 has 16 divisors (see below), whose sum is σ = 180660740160. Its totient is φ = 54198221904.

The previous prime is 101621666189. The next prime is 101621666213. The reversal of 101621666205 is 502666126101.

It is not a de Polignac number, because 101621666205 - 2⁴ = 101621666189 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 101621666205.

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, 376376407 + ... + 376376676.

It is an arithmetic number, because the mean of its divisors is an integer number (11291296260).

Almost surely, 2^101621666205 is an apocalyptic number.

101621666205 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

101621666205 is a deficient number, since it is larger than the sum of its proper divisors (79039073955).

101621666205 is an equidigital number, since it uses as much as digits as its factorization.

101621666205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 752753097 (or 752753091 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The spelling of 101621666205 in words is "one hundred one billion, six hundred twenty-one million, six hundred sixty-six thousand, two hundred five".