1722166885 has 8 divisors (see below), whose sum is σ = 2137862520. Its totient is φ = 1330225344.

The previous prime is 1722166879. The next prime is 1722166891. The reversal of 1722166885 is 5886612271.

It is an interprime number because it is at equal distance from previous prime (1722166879) and next prime (1722166891).

It can be written as a sum of positive squares in 4 ways, for example, as 218123361 + 1504043524 = 14769^2 + 38782^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1722166885 - 2³ = 1722166877 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5938362 + ... + 5938651.

It is an arithmetic number, because the mean of its divisors is an integer number (267232815).

Almost surely, 2^1722166885 is an apocalyptic number.

It is an amenable number.

1722166885 is a deficient number, since it is larger than the sum of its proper divisors (415695635).

1722166885 is a wasteful number, since it uses less digits than its factorization.

1722166885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11877047.

The product of its digits is 322560, while the sum is 46.

The square root of 1722166885 is about 41498.9986023759. The cubic root of 1722166885 is about 1198.6482197116.

It can be divided in two parts, 172216 and 6885, that added together give a triangular number (179101 = T₅₉₈).

The spelling of 1722166885 in words is "one billion, seven hundred twenty-two million, one hundred sixty-six thousand, eight hundred eighty-five".