101720885905 has 16 divisors (see below), whose sum is σ = 122407790400. Its totient is φ = 81148541760.

The previous prime is 101720885881. The next prime is 101720885909. The reversal of 101720885905 is 509588027101.

It is not a de Polignac number, because 101720885905 - 2⁵ = 101720885873 is a prime.

It is not an unprimeable number, because it can be changed into a prime (101720885909) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2639475 + ... + 2677735.

It is an arithmetic number, because the mean of its divisors is an integer number (7650486900).

Almost surely, 2^101720885905 is an apocalyptic number.

It is an amenable number.

101720885905 is a deficient number, since it is larger than the sum of its proper divisors (20686904495).

101720885905 is an equidigital number, since it uses as much as digits as its factorization.

101720885905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39744.

The product of its (nonzero) digits is 201600, while the sum is 46.

The spelling of 101720885905 in words is "one hundred one billion, seven hundred twenty million, eight hundred eighty-five thousand, nine hundred five".