71690238661 has 2 divisors, whose sum is σ = 71690238662. Its totient is φ = 71690238660.

The previous prime is 71690238623. The next prime is 71690238667. The reversal of 71690238661 is 16683209617.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 71104889025 + 585349636 = 266655^2 + 24194^2 .

It is a cyclic number.

It is not a de Polignac number, because 71690238661 - 2²¹ = 71688141509 is a prime.

It is a super-2 number, since 2×71690238661² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71690238667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35845119330 + 35845119331.

It is an arithmetic number, because the mean of its divisors is an integer number (35845119331).

Almost surely, 2^71690238661 is an apocalyptic number.

It is an amenable number.

71690238661 is a deficient number, since it is larger than the sum of its proper divisors (1).

71690238661 is an equidigital number, since it uses as much as digits as its factorization.

71690238661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 653184, while the sum is 49.

The spelling of 71690238661 in words is "seventy-one billion, six hundred ninety million, two hundred thirty-eight thousand, six hundred sixty-one".