166523649 has 16 divisors (see below), whose sum is σ = 229462464. Its totient is φ = 107352000.

The previous prime is 166523641. The next prime is 166523659. The reversal of 166523649 is 946325661.

166523649 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 166523649 - 2³ = 166523641 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 166523649.

It is not an unprimeable number, because it can be changed into a prime (166523641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6639 + ... + 19419.

It is an arithmetic number, because the mean of its divisors is an integer number (14341404).

Almost surely, 2^166523649 is an apocalyptic number.

It is an amenable number.

166523649 is a deficient number, since it is larger than the sum of its proper divisors (62938815).

166523649 is a wasteful number, since it uses less digits than its factorization.

166523649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12928.

The product of its digits is 233280, while the sum is 42.

The square root of 166523649 is about 12904.4042481627. The cubic root of 166523649 is about 550.1637517922.

It can be divided in two parts, 16652 and 3649, that added together give a triangular number (20301 = T₂₀₁).

The spelling of 166523649 in words is "one hundred sixty-six million, five hundred twenty-three thousand, six hundred forty-nine".