71729266099669 has 2 divisors, whose sum is σ = 71729266099670. Its totient is φ = 71729266099668.

The previous prime is 71729266099661. The next prime is 71729266099747. The reversal of 71729266099669 is 96699066292717.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65322571088644 + 6406695011025 = 8082238^2 + 2531145^2 .

It is a cyclic number.

It is not a de Polignac number, because 71729266099669 - 2³ = 71729266099661 is a prime.

It is a super-2 number, since 2×71729266099669² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71729266099661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35864633049834 + 35864633049835.

It is an arithmetic number, because the mean of its divisors is an integer number (35864633049835).

Almost surely, 2^{71729266099669} is an apocalyptic number.

It is an amenable number.

71729266099669 is a deficient number, since it is larger than the sum of its proper divisors (1).

71729266099669 is an equidigital number, since it uses as much as digits as its factorization.

71729266099669 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1666598976, while the sum is 79.

The spelling of 71729266099669 in words is "seventy-one trillion, seven hundred twenty-nine billion, two hundred sixty-six million, ninety-nine thousand, six hundred sixty-nine".