81406740132 has 36 divisors (see below), whose sum is σ = 214725026880. Its totient is φ = 25955771952.

The previous prime is 81406740113. The next prime is 81406740157. The reversal of 81406740132 is 23104760418.

81406740132 is a `hidden beast` number, since 81 + 406 + 7 + 40 + 132 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 49157832 + ... + 49159487.

It is an arithmetic number, because the mean of its divisors is an integer number (5964584080).

Almost surely, 2^81406740132 is an apocalyptic number.

It is an amenable number.

81406740132 is an abundant number, since it is smaller than the sum of its proper divisors (133318286748).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81406740132 is a wasteful number, since it uses less digits than its factorization.

81406740132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98317352 (or 98317347 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The spelling of 81406740132 in words is "eighty-one billion, four hundred six million, seven hundred forty thousand, one hundred thirty-two".