71255017764138 has 16 divisors (see below), whose sum is σ = 153472345953696. Its totient is φ = 21924620850480.

The previous prime is 71255017764083. The next prime is 71255017764143. The reversal of 71255017764138 is 83146771055217.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 456762934308 + ... + 456762934463.

It is an arithmetic number, because the mean of its divisors is an integer number (9592021622106).

Almost surely, 2^{71255017764138} is an apocalyptic number.

71255017764138 is a gapful number since it is divisible by the number (78) formed by its first and last digit.

71255017764138 is an abundant number, since it is smaller than the sum of its proper divisors (82217328189558).

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

71255017764138 is a wasteful number, since it uses less digits than its factorization.

71255017764138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 913525868789.

The product of its (nonzero) digits is 9878400, while the sum is 57.

The spelling of 71255017764138 in words is "seventy-one trillion, two hundred fifty-five billion, seventeen million, seven hundred sixty-four thousand, one hundred thirty-eight".