71721133678 has 4 divisors (see below), whose sum is σ = 107581700520. Its totient is φ = 35860566838.

The previous prime is 71721133643. The next prime is 71721133697. The reversal of 71721133678 is 87633112717.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17930283418 + ... + 17930283421.

It is an arithmetic number, because the mean of its divisors is an integer number (26895425130).

Almost surely, 2^71721133678 is an apocalyptic number.

71721133678 is a deficient number, since it is larger than the sum of its proper divisors (35860566842).

71721133678 is a wasteful number, since it uses less digits than its factorization.

71721133678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35860566841.

The product of its digits is 296352, while the sum is 46.

The spelling of 71721133678 in words is "seventy-one billion, seven hundred twenty-one million, one hundred thirty-three thousand, six hundred seventy-eight".