81645508030 has 16 divisors (see below), whose sum is σ = 149452795440. Its totient is φ = 32104674112.

The previous prime is 81645508003. The next prime is 81645508039. The reversal of 81645508030 is 3080554618.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81645508039) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 69190519 + ... + 69191698.

It is an arithmetic number, because the mean of its divisors is an integer number (9340799715).

Almost surely, 2^81645508030 is an apocalyptic number.

81645508030 is a deficient number, since it is larger than the sum of its proper divisors (67807287410).

81645508030 is a wasteful number, since it uses less digits than its factorization.

81645508030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138382283.

The product of its (nonzero) digits is 115200, while the sum is 40.

The spelling of 81645508030 in words is "eighty-one billion, six hundred forty-five million, five hundred eight thousand, thirty".