81349615623 has 16 divisors (see below), whose sum is σ = 114187750400. Its totient is φ = 51372921600.

The previous prime is 81349615609. The next prime is 81349615637. The reversal of 81349615623 is 32651694318.

It is an interprime number because it is at equal distance from previous prime (81349615609) and next prime (81349615637).

It is not a de Polignac number, because 81349615623 - 2¹³ = 81349607431 is a prime.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81349615673) 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, 462423 + ... + 613623.

It is an arithmetic number, because the mean of its divisors is an integer number (7136734400).

Almost surely, 2^81349615623 is an apocalyptic number.

81349615623 is a deficient number, since it is larger than the sum of its proper divisors (32838134777).

81349615623 is a wasteful number, since it uses less digits than its factorization.

81349615623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160662.

The product of its digits is 933120, while the sum is 48.

The spelling of 81349615623 in words is "eighty-one billion, three hundred forty-nine million, six hundred fifteen thousand, six hundred twenty-three".