71390815705 has 16 divisors (see below), whose sum is σ = 93462393024. Its totient is φ = 51917634880.

The previous prime is 71390815703. The next prime is 71390815711. The reversal of 71390815705 is 50751809317.

It is not a de Polignac number, because 71390815705 - 2¹ = 71390815703 is a prime.

It is not an unprimeable number, because it can be changed into a prime (71390815703) 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, 1552707 + ... + 1598023.

It is an arithmetic number, because the mean of its divisors is an integer number (5841399564).

Almost surely, 2^71390815705 is an apocalyptic number.

It is an amenable number.

71390815705 is a deficient number, since it is larger than the sum of its proper divisors (22071577319).

71390815705 is a wasteful number, since it uses less digits than its factorization.

71390815705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73976.

The product of its (nonzero) digits is 264600, while the sum is 46.

The spelling of 71390815705 in words is "seventy-one billion, three hundred ninety million, eight hundred fifteen thousand, seven hundred five".