83969400905 has 16 divisors (see below), whose sum is σ = 108566622864. Its totient is φ = 61978275840.

The previous prime is 83969400887. The next prime is 83969400961. The reversal of 83969400905 is 50900496938.

It can be written as a sum of positive squares in 8 ways, for example, as 377291776 + 83592109129 = 19424^2 + 289123^2 .

It is not a de Polignac number, because 83969400905 - 2²⁰ = 83968352329 is a prime.

It is a super-2 number, since 2×83969400905² (a number of 23 digits) contains 22 as substring.

It is a Duffinian 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, 175124 + ... + 445653.

It is an arithmetic number, because the mean of its divisors is an integer number (6785413929).

Almost surely, 2^83969400905 is an apocalyptic number.

It is an amenable number.

83969400905 is a deficient number, since it is larger than the sum of its proper divisors (24597221959).

83969400905 is a wasteful number, since it uses less digits than its factorization.

83969400905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 622876.

The product of its (nonzero) digits is 2099520, while the sum is 53.

The spelling of 83969400905 in words is "eighty-three billion, nine hundred sixty-nine million, four hundred thousand, nine hundred five".