166590649 has 3 divisors (see below), whose sum is σ = 166603557. Its totient is φ = 166577742.

The previous prime is 166590647. The next prime is 166590691. The reversal of 166590649 is 946095661.

The square root of 166590649 is 12907.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 166590649 - 2¹ = 166590647 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 166590599 and 166590608.

It is not an unprimeable number, because it can be changed into a prime (166590647) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 6454 + ... + 19360.

It is an arithmetic number, because the mean of its divisors is an integer number (55534519).

Almost surely, 2^166590649 is an apocalyptic number.

166590649 is the 12907-th square number.

166590649 is the 6454-th centered octagonal number.

It is an amenable number.

166590649 is a deficient number, since it is larger than the sum of its proper divisors (12908).

166590649 is an frugal number, since it uses more digits than its factorization.

166590649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25814 (or 12907 counting only the distinct ones).

The product of its (nonzero) digits is 349920, while the sum is 46.

The cubic root of 166590649 is about 550.2375271570.

The spelling of 166590649 in words is "one hundred sixty-six million, five hundred ninety thousand, six hundred forty-nine".