81045601608 has 32 divisors (see below), whose sum is σ = 202776300000. Its totient is φ = 26993561088.

The previous prime is 81045601597. The next prime is 81045601643. The reversal of 81045601608 is 80610654018.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1321866 + ... + 1381817.

It is an arithmetic number, because the mean of its divisors is an integer number (6336759375).

Almost surely, 2^81045601608 is an apocalyptic number.

It is an amenable number.

81045601608 is an abundant number, since it is smaller than the sum of its proper divisors (121730698392).

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

81045601608 is a wasteful number, since it uses less digits than its factorization.

81045601608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2704941 (or 2704937 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 39.

The spelling of 81045601608 in words is "eighty-one billion, forty-five million, six hundred one thousand, six hundred eight".