7172899823 has 4 divisors (see below), whose sum is σ = 7209310680. Its totient is φ = 7136488968.

The previous prime is 7172899819. The next prime is 7172899843. The reversal of 7172899823 is 3289982717.

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 7172899823 - 2² = 7172899819 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 (7172899813) 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, 18205133 + ... + 18205526.

It is an arithmetic number, because the mean of its divisors is an integer number (1802327670).

Almost surely, 2^7172899823 is an apocalyptic number.

7172899823 is a deficient number, since it is larger than the sum of its proper divisors (36410857).

7172899823 is a wasteful number, since it uses less digits than its factorization.

7172899823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36410856.

The product of its digits is 3048192, while the sum is 56.

The square root of 7172899823 is about 84692.9738703276. The cubic root of 7172899823 is about 1928.5530442533.

The spelling of 7172899823 in words is "seven billion, one hundred seventy-two million, eight hundred ninety-nine thousand, eight hundred twenty-three".