81173369070 has 48 divisors (see below), whose sum is σ = 216198348912. Its totient is φ = 21118273920.

The previous prime is 81173369059. The next prime is 81173369171. The reversal of 81173369070 is 7096337118.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10995412 + ... + 11002791.

It is an arithmetic number, because the mean of its divisors is an integer number (4504132269).

Almost surely, 2^81173369070 is an apocalyptic number.

81173369070 is an abundant number, since it is smaller than the sum of its proper divisors (135024979842).

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

81173369070 is a wasteful number, since it uses less digits than its factorization.

81173369070 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21998257 (or 21998254 counting only the distinct ones).

The product of its (nonzero) digits is 190512, while the sum is 45.

The spelling of 81173369070 in words is "eighty-one billion, one hundred seventy-three million, three hundred sixty-nine thousand, seventy".