101815989405 has 64 divisors (see below), whose sum is σ = 181803460608. Its totient is φ = 48318382080.

The previous prime is 101815989391. The next prime is 101815989449. The reversal of 101815989405 is 504989518101.

It is not a de Polignac number, because 101815989405 - 2¹² = 101815985309 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1520797 + ... + 1586333.

It is an arithmetic number, because the mean of its divisors is an integer number (2840679072).

Almost surely, 2^101815989405 is an apocalyptic number.

101815989405 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

101815989405 is a deficient number, since it is larger than the sum of its proper divisors (79987471203).

101815989405 is a wasteful number, since it uses less digits than its factorization.

101815989405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65846.

The product of its (nonzero) digits is 518400, while the sum is 51.

The spelling of 101815989405 in words is "one hundred one billion, eight hundred fifteen million, nine hundred eighty-nine thousand, four hundred five".