81023385630 has 64 divisors (see below), whose sum is σ = 212193105408. Its totient is φ = 19636556160.

The previous prime is 81023385607. The next prime is 81023385643. The reversal of 81023385630 is 3658332018.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1220679 + ... + 1285341.

It is an arithmetic number, because the mean of its divisors is an integer number (3315517272).

Almost surely, 2^81023385630 is an apocalyptic number.

81023385630 is an abundant number, since it is smaller than the sum of its proper divisors (131169719778).

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

81023385630 is a wasteful number, since it uses less digits than its factorization.

81023385630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68481.

The product of its (nonzero) digits is 103680, while the sum is 39.

The spelling of 81023385630 in words is "eighty-one billion, twenty-three million, three hundred eighty-five thousand, six hundred thirty".