83778931455 has 16 divisors (see below), whose sum is σ = 141101358720. Its totient is φ = 42330407328.

The previous prime is 83778931447. The next prime is 83778931477. The reversal of 83778931455 is 55413987738.

It is a happy number.

It is not a de Polignac number, because 83778931455 - 2³ = 83778931447 is a prime.

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, 146980297 + ... + 146980866.

It is an arithmetic number, because the mean of its divisors is an integer number (8818834920).

Almost surely, 2^83778931455 is an apocalyptic number.

83778931455 is a deficient number, since it is larger than the sum of its proper divisors (57322427265).

83778931455 is a wasteful number, since it uses less digits than its factorization.

83778931455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 293961190.

The product of its digits is 25401600, while the sum is 60.

The spelling of 83778931455 in words is "eighty-three billion, seven hundred seventy-eight million, nine hundred thirty-one thousand, four hundred fifty-five".