722165816 has 8 divisors (see below), whose sum is σ = 1354060920. Its totient is φ = 361082904.

The previous prime is 722165803. The next prime is 722165827. The reversal of 722165816 is 618561227.

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 722165816.

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, 45135356 + ... + 45135371.

It is an arithmetic number, because the mean of its divisors is an integer number (169257615).

Almost surely, 2^722165816 is an apocalyptic number.

It is an amenable number.

722165816 is a deficient number, since it is larger than the sum of its proper divisors (631895104).

722165816 is a wasteful number, since it uses less digits than its factorization.

722165816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90270733 (or 90270729 counting only the distinct ones).

The product of its digits is 40320, while the sum is 38.

The square root of 722165816 is about 26873.1430242166. The cubic root of 722165816 is about 897.1787439690.

It can be divided in two parts, 7221 and 65816, that added together give a palindrome (73037).

The spelling of 722165816 in words is "seven hundred twenty-two million, one hundred sixty-five thousand, eight hundred sixteen".