81392127663 has 64 divisors (see below), whose sum is σ = 137925918720. Its totient is φ = 41468544000.

The previous prime is 81392127653. The next prime is 81392127671. The reversal of 81392127663 is 36672129318.

It is not a de Polignac number, because 81392127663 - 2⁵ = 81392127631 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81392127653) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2740831 + ... + 2770367.

It is an arithmetic number, because the mean of its divisors is an integer number (2155092480).

Almost surely, 2^81392127663 is an apocalyptic number.

81392127663 is a deficient number, since it is larger than the sum of its proper divisors (56533791057).

81392127663 is a wasteful number, since it uses less digits than its factorization.

81392127663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29788.

The product of its digits is 653184, while the sum is 48.

The spelling of 81392127663 in words is "eighty-one billion, three hundred ninety-two million, one hundred twenty-seven thousand, six hundred sixty-three".