81529495615 has 16 divisors (see below), whose sum is σ = 102997238400. Its totient is φ = 61783208352.

The previous prime is 81529495561. The next prime is 81529495637. The reversal of 81529495615 is 51659492518.

It is not a de Polignac number, because 81529495615 - 2¹¹ = 81529493567 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 799596 + ... + 895774.

It is an arithmetic number, because the mean of its divisors is an integer number (6437327400).

Almost surely, 2^81529495615 is an apocalyptic number.

81529495615 is a deficient number, since it is larger than the sum of its proper divisors (21467742785).

81529495615 is a wasteful number, since it uses less digits than its factorization.

81529495615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105126.

The product of its digits is 3888000, while the sum is 55.

The spelling of 81529495615 in words is "eighty-one billion, five hundred twenty-nine million, four hundred ninety-five thousand, six hundred fifteen".