71690442185 has 4 divisors (see below), whose sum is σ = 86028530628. Its totient is φ = 57352353744.

The previous prime is 71690442157. The next prime is 71690442191. The reversal of 71690442185 is 58124409617.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13008771136 + 58681671049 = 114056^2 + 242243^2 .

It is a cyclic number.

It is not a de Polignac number, because 71690442185 - 2²² = 71686247881 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7169044214 + ... + 7169044223.

It is an arithmetic number, because the mean of its divisors is an integer number (21507132657).

Almost surely, 2^71690442185 is an apocalyptic number.

It is an amenable number.

71690442185 is a deficient number, since it is larger than the sum of its proper divisors (14338088443).

71690442185 is a wasteful number, since it uses less digits than its factorization.

71690442185 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14338088442.

The product of its (nonzero) digits is 483840, while the sum is 47.

The spelling of 71690442185 in words is "seventy-one billion, six hundred ninety million, four hundred forty-two thousand, one hundred eighty-five".