85721672443 has 4 divisors (see below), whose sum is σ = 93514551768. Its totient is φ = 77928793120.

The previous prime is 85721672383. The next prime is 85721672479. The reversal of 85721672443 is 34427612758.

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 85721672443 - 2²⁵ = 85688118011 is a prime.

It is not an unprimeable number, because it can be changed into a prime (85721672243) 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, 3896439646 + ... + 3896439667.

It is an arithmetic number, because the mean of its divisors is an integer number (23378637942).

Almost surely, 2^85721672443 is an apocalyptic number.

85721672443 is a deficient number, since it is larger than the sum of its proper divisors (7792879325).

85721672443 is a wasteful number, since it uses less digits than its factorization.

85721672443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7792879324.

The product of its digits is 2257920, while the sum is 49.

The spelling of 85721672443 in words is "eighty-five billion, seven hundred twenty-one million, six hundred seventy-two thousand, four hundred forty-three".