81620882602 has 24 divisors (see below), whose sum is σ = 142934311044. Its totient is φ = 34854083712.

The previous prime is 81620882599. The next prime is 81620882627. The reversal of 81620882602 is 20628802618.

It can be written as a sum of positive squares in 2 ways, for example, as 81619347481 + 1535121 = 285691^2 + 1239^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1476223 + ... + 1530514.

Almost surely, 2^81620882602 is an apocalyptic number.

81620882602 is a deficient number, since it is larger than the sum of its proper divisors (61313428442).

81620882602 is a wasteful number, since it uses less digits than its factorization.

81620882602 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3007030 (or 3007023 counting only the distinct ones).

The product of its (nonzero) digits is 147456, while the sum is 43.

The spelling of 81620882602 in words is "eighty-one billion, six hundred twenty million, eight hundred eighty-two thousand, six hundred two".