81754041138 has 32 divisors (see below), whose sum is σ = 203854233600. Its totient is φ = 21234815760.

The previous prime is 81754041137. The next prime is 81754041151. The reversal of 81754041138 is 83114045718.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a self number, because there is not a number n which added to its sum of digits gives 81754041138.

It is not an unprimeable number, because it can be changed into a prime (81754041137) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 88477938 + ... + 88478861.

It is an arithmetic number, because the mean of its divisors is an integer number (6370444800).

Almost surely, 2^81754041138 is an apocalyptic number.

81754041138 is an abundant number, since it is smaller than the sum of its proper divisors (122100192462).

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

81754041138 is a wasteful number, since it uses less digits than its factorization.

81754041138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176956822.

The product of its (nonzero) digits is 107520, while the sum is 42.

The spelling of 81754041138 in words is "eighty-one billion, seven hundred fifty-four million, forty-one thousand, one hundred thirty-eight".