71745631399 has 4 divisors (see below), whose sum is σ = 77264526136. Its totient is φ = 66226736664.

The previous prime is 71745631367. The next prime is 71745631481. The reversal of 71745631399 is 99313654717.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99313654717 = 263 ⋅377618459.

It is a cyclic number.

It is not a de Polignac number, because 71745631399 - 2⁵ = 71745631367 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71745637399) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2759447349 + ... + 2759447374.

It is an arithmetic number, because the mean of its divisors is an integer number (19316131534).

Almost surely, 2^71745631399 is an apocalyptic number.

71745631399 is a deficient number, since it is larger than the sum of its proper divisors (5518894737).

71745631399 is a wasteful number, since it uses less digits than its factorization.

71745631399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5518894736.

The product of its digits is 4286520, while the sum is 55.

The spelling of 71745631399 in words is "seventy-one billion, seven hundred forty-five million, six hundred thirty-one thousand, three hundred ninety-nine".