81293138057010 has 64 divisors (see below), whose sum is σ = 212843235492864. Its totient is φ = 19707147825600.

The previous prime is 81293138057009. The next prime is 81293138057017. The reversal of 81293138057010 is 1075083139218.

It is not an unprimeable number, because it can be changed into a prime (81293138057017) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 22039027 + ... + 25461833.

It is an arithmetic number, because the mean of its divisors is an integer number (3325675554576).

Almost surely, 2^{81293138057010} is an apocalyptic number.

81293138057010 is an abundant number, since it is smaller than the sum of its proper divisors (131550097435854).

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

81293138057010 is a wasteful number, since it uses less digits than its factorization.

81293138057010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3494799.

The product of its (nonzero) digits is 362880, while the sum is 48.

The spelling of 81293138057010 in words is "eighty-one trillion, two hundred ninety-three billion, one hundred thirty-eight million, fifty-seven thousand, ten".