81594897592890 has 64 divisors (see below), whose sum is σ = 213747465019392. Its totient is φ = 19769730523200.

The previous prime is 81594897592811. The next prime is 81594897592903. The reversal of 81594897592890 is 9829579849518.

81594897592890 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 67214446 + ... + 68417625.

It is an arithmetic number, because the mean of its divisors is an integer number (3339804140928).

Almost surely, 2^{81594897592890} is an apocalyptic number.

81594897592890 is an abundant number, since it is smaller than the sum of its proper divisors (132152567426502).

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

81594897592890 is a wasteful number, since it uses less digits than its factorization.

81594897592890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135633915.

The product of its (nonzero) digits is 4702924800, while the sum is 84.

The spelling of 81594897592890 in words is "eighty-one trillion, five hundred ninety-four billion, eight hundred ninety-seven million, five hundred ninety-two thousand, eight hundred ninety".