81992709015 has 32 divisors (see below), whose sum is σ = 150072652800. Its totient is φ = 37446599424.

The previous prime is 81992708989. The next prime is 81992709017. The reversal of 81992709015 is 51090729918.

It is not a de Polignac number, because 81992709015 - 2⁵ = 81992708983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81992709017) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 262059 + ... + 482348.

It is an arithmetic number, because the mean of its divisors is an integer number (4689770400).

Almost surely, 2^81992709015 is an apocalyptic number.

81992709015 is a deficient number, since it is larger than the sum of its proper divisors (68079943785).

81992709015 is a wasteful number, since it uses less digits than its factorization.

81992709015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 745471.

The product of its (nonzero) digits is 408240, while the sum is 51.

The spelling of 81992709015 in words is "eighty-one billion, nine hundred ninety-two million, seven hundred nine thousand, fifteen".