71917864646 has 4 divisors (see below), whose sum is σ = 107876796972. Its totient is φ = 35958932322.

The previous prime is 71917864609. The next prime is 71917864703. The reversal of 71917864646 is 64646871917.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 64646871917 = 19 ⋅3402466943.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17979466160 + ... + 17979466163.

It is an arithmetic number, because the mean of its divisors is an integer number (26969199243).

Almost surely, 2^71917864646 is an apocalyptic number.

71917864646 is a deficient number, since it is larger than the sum of its proper divisors (35958932326).

71917864646 is a wasteful number, since it uses less digits than its factorization.

71917864646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35958932325.

The product of its digits is 12192768, while the sum is 59.

The spelling of 71917864646 in words is "seventy-one billion, nine hundred seventeen million, eight hundred sixty-four thousand, six hundred forty-six".