81470967140 has 12 divisors (see below), whose sum is σ = 171089031036. Its totient is φ = 32588386848.

The previous prime is 81470967113. The next prime is 81470967143. The reversal of 81470967140 is 4176907418.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 19207742464 + 62263224676 = 138592^2 + 249526^2 .

It is not an unprimeable number, because it can be changed into a prime (81470967143) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2036774159 + ... + 2036774198.

It is an arithmetic number, because the mean of its divisors is an integer number (14257419253).

Almost surely, 2^81470967140 is an apocalyptic number.

It is an amenable number.

81470967140 is an abundant number, since it is smaller than the sum of its proper divisors (89618063896).

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

81470967140 is a wasteful number, since it uses less digits than its factorization.

81470967140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4073548366 (or 4073548364 counting only the distinct ones).

The product of its (nonzero) digits is 338688, while the sum is 47.

The spelling of 81470967140 in words is "eighty-one billion, four hundred seventy million, nine hundred sixty-seven thousand, one hundred forty".