81392378031630 has 40 divisors (see below), whose sum is σ = 218855060931672. Its totient is φ = 21704634141552.

The previous prime is 81392378031529. The next prime is 81392378031637. The reversal of 81392378031630 is 3613087329318.

81392378031630 is a `hidden beast` number, since 8 + 13 + 9 + 237 + 80 + 316 + 3 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81392378031637) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 50242207852 + ... + 50242209471.

Almost surely, 2^{81392378031630} is an apocalyptic number.

81392378031630 is an abundant number, since it is smaller than the sum of its proper divisors (137462682900042).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81392378031630 is a wasteful number, since it uses less digits than its factorization.

81392378031630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100484417342 (or 100484417333 counting only the distinct ones).

The product of its (nonzero) digits is 3919104, while the sum is 54.

The spelling of 81392378031630 in words is "eighty-one trillion, three hundred ninety-two billion, three hundred seventy-eight million, thirty-one thousand, six hundred thirty".