71646879247 has 4 divisors (see below), whose sum is σ = 74117461320. Its totient is φ = 69176297176.

The previous prime is 71646879229. The next prime is 71646879251. The reversal of 71646879247 is 74297864617.

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 71646879247 - 2²³ = 71638490639 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 (71646879347) 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, 1235290993 + ... + 1235291050.

It is an arithmetic number, because the mean of its divisors is an integer number (18529365330).

Almost surely, 2^71646879247 is an apocalyptic number.

71646879247 is a deficient number, since it is larger than the sum of its proper divisors (2470582073).

71646879247 is a wasteful number, since it uses less digits than its factorization.

71646879247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2470582072.

The product of its digits is 28449792, while the sum is 61.

The spelling of 71646879247 in words is "seventy-one billion, six hundred forty-six million, eight hundred seventy-nine thousand, two hundred forty-seven".