71138735999 has 4 divisors (see below), whose sum is σ = 71224757064. Its totient is φ = 71052714936.

The previous prime is 71138735989. The next prime is 71138736013. The reversal of 71138735999 is 99953783117.

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

It is a cyclic number.

It is not a de Polignac number, because 71138735999 - 2⁸ = 71138735743 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 (71138735909) 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, 43009292 + ... + 43010945.

It is an arithmetic number, because the mean of its divisors is an integer number (17806189266).

Almost surely, 2^71138735999 is an apocalyptic number.

71138735999 is a deficient number, since it is larger than the sum of its proper divisors (86021065).

71138735999 is an equidigital number, since it uses as much as digits as its factorization.

71138735999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86021064.

The product of its digits is 12859560, while the sum is 62.

The spelling of 71138735999 in words is "seventy-one billion, one hundred thirty-eight million, seven hundred thirty-five thousand, nine hundred ninety-nine".