81372819630 has 32 divisors (see below), whose sum is σ = 195302267424. Its totient is φ = 21698585216.

The previous prime is 81372819557. The next prime is 81372819673. The reversal of 81372819630 is 3691827318.

It is a self number, because there is not a number n which added to its sum of digits gives 81372819630.

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, 1516744 + ... + 1569476.

It is an arithmetic number, because the mean of its divisors is an integer number (6103195857).

Almost surely, 2^81372819630 is an apocalyptic number.

81372819630 is an abundant number, since it is smaller than the sum of its proper divisors (113929447794).

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

81372819630 is a wasteful number, since it uses less digits than its factorization.

81372819630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104180.

The product of its (nonzero) digits is 435456, while the sum is 48.

The spelling of 81372819630 in words is "eighty-one billion, three hundred seventy-two million, eight hundred nineteen thousand, six hundred thirty".