83777809825 has 6 divisors (see below), whose sum is σ = 103884484214. Its totient is φ = 67022247840.

The previous prime is 83777809807. The next prime is 83777809831. The reversal of 83777809825 is 52890877738.

It can be written as a sum of positive squares in 3 ways, for example, as 1461609361 + 82316200464 = 38231^2 + 286908^2 .

It is not a de Polignac number, because 83777809825 - 2⁵ = 83777809793 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1675556172 + ... + 1675556221.

Almost surely, 2^83777809825 is an apocalyptic number.

It is an amenable number.

83777809825 is a deficient number, since it is larger than the sum of its proper divisors (20106674389).

83777809825 is a wasteful number, since it uses less digits than its factorization.

83777809825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3351112403 (or 3351112398 counting only the distinct ones).

The product of its (nonzero) digits is 47416320, while the sum is 64.

The spelling of 83777809825 in words is "eighty-three billion, seven hundred seventy-seven million, eight hundred nine thousand, eight hundred twenty-five".