81392127632 has 40 divisors (see below), whose sum is σ = 159651388800. Its totient is φ = 40192815872.

The previous prime is 81392127631. The next prime is 81392127653. The reversal of 81392127632 is 23672129318.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (81392127631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1230869 + ... + 1295307.

It is an arithmetic number, because the mean of its divisors is an integer number (3991284720).

Almost surely, 2^81392127632 is an apocalyptic number.

It is an amenable number.

81392127632 is a deficient number, since it is larger than the sum of its proper divisors (78259261168).

81392127632 is a wasteful number, since it uses less digits than its factorization.

81392127632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65423 (or 65417 counting only the distinct ones).

The product of its digits is 217728, while the sum is 44.

The spelling of 81392127632 in words is "eighty-one billion, three hundred ninety-two million, one hundred twenty-seven thousand, six hundred thirty-two".