71690238665 has 8 divisors (see below), whose sum is σ = 86363028360. Its totient is φ = 57129029632.

The previous prime is 71690238661. The next prime is 71690238667. The reversal of 71690238665 is 56683209617.

It can be written as a sum of positive squares in 4 ways, for example, as 14615117449 + 57075121216 = 120893^2 + 238904^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 71690238665 - 2² = 71690238661 is a prime.

It is not an unprimeable number, because it can be changed into a prime (71690238661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27893750 + ... + 27896319.

It is an arithmetic number, because the mean of its divisors is an integer number (10795378545).

Almost surely, 2^71690238665 is an apocalyptic number.

It is an amenable number.

71690238665 is a deficient number, since it is larger than the sum of its proper divisors (14672789695).

71690238665 is a wasteful number, since it uses less digits than its factorization.

71690238665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55790331.

The product of its (nonzero) digits is 3265920, while the sum is 53.

The spelling of 71690238665 in words is "seventy-one billion, six hundred ninety million, two hundred thirty-eight thousand, six hundred sixty-five".