81098902252 has 12 divisors (see below), whose sum is σ = 142450675920. Its totient is φ = 40398709136.

The previous prime is 81098902193. The next prime is 81098902253. The reversal of 81098902252 is 25220989018.

It is not an unprimeable number, because it can be changed into a prime (81098902253) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37684288 + ... + 37686439.

It is an arithmetic number, because the mean of its divisors is an integer number (11870889660).

Almost surely, 2^81098902252 is an apocalyptic number.

It is an amenable number.

81098902252 is a deficient number, since it is larger than the sum of its proper divisors (61351773668).

81098902252 is a wasteful number, since it uses less digits than its factorization.

81098902252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75371000 (or 75370998 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 46.

The spelling of 81098902252 in words is "eighty-one billion, ninety-eight million, nine hundred two thousand, two hundred fifty-two".