81190718004 has 48 divisors (see below), whose sum is σ = 206868082176. Its totient is φ = 24579343200.

The previous prime is 81190718003. The next prime is 81190718023. The reversal of 81190718004 is 40081709118.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81190718003) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 162202 + ... + 434385.

It is an arithmetic number, because the mean of its divisors is an integer number (4309751712).

Almost surely, 2^81190718004 is an apocalyptic number.

It is an amenable number.

81190718004 is an abundant number, since it is smaller than the sum of its proper divisors (125677364172).

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

81190718004 is a wasteful number, since it uses less digits than its factorization.

81190718004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 597636 (or 597634 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 39.

The spelling of 81190718004 in words is "eighty-one billion, one hundred ninety million, seven hundred eighteen thousand, four".