71399159779 has 4 divisors (see below), whose sum is σ = 71431050880. Its totient is φ = 71367268680.

The previous prime is 71399159759. The next prime is 71399159869. The reversal of 71399159779 is 97795199317.

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 71399159779 - 2⁷ = 71399159651 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71399159759) 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, 15942192 + ... + 15946669.

It is an arithmetic number, because the mean of its divisors is an integer number (17857762720).

Almost surely, 2^71399159779 is an apocalyptic number.

71399159779 is a deficient number, since it is larger than the sum of its proper divisors (31891101).

71399159779 is a wasteful number, since it uses less digits than its factorization.

71399159779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31891100.

The product of its digits is 33756345, while the sum is 67.

The spelling of 71399159779 in words is "seventy-one billion, three hundred ninety-nine million, one hundred fifty-nine thousand, seven hundred seventy-nine".