81545980490 has 32 divisors (see below), whose sum is σ = 166393422720. Its totient is φ = 28524585024.

The previous prime is 81545980489. The next prime is 81545980543. The reversal of 81545980490 is 9408954518.

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, 16504814 + ... + 16509753.

It is an arithmetic number, because the mean of its divisors is an integer number (5199794460).

Almost surely, 2^81545980490 is an apocalyptic number.

81545980490 is an abundant number, since it is smaller than the sum of its proper divisors (84847442230).

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

81545980490 is a wasteful number, since it uses less digits than its factorization.

81545980490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33014606.

The product of its (nonzero) digits is 2073600, while the sum is 53.

The spelling of 81545980490 in words is "eighty-one billion, five hundred forty-five million, nine hundred eighty thousand, four hundred ninety".