166645245 has 32 divisors (see below), whose sum is σ = 289965312. Its totient is φ = 81234432.

The previous prime is 166645211. The next prime is 166645247. The reversal of 166645245 is 542546661.

It is not a de Polignac number, because 166645245 - 2¹⁵ = 166612477 is a prime.

It is a super-2 number, since 2×166645245² = 55541275362220050, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166645247) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15937 + ... + 24233.

It is an arithmetic number, because the mean of its divisors is an integer number (9061416).

Almost surely, 2^166645245 is an apocalyptic number.

166645245 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

166645245 is a deficient number, since it is larger than the sum of its proper divisors (123320067).

166645245 is a wasteful number, since it uses less digits than its factorization.

166645245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8421.

The product of its digits is 172800, while the sum is 39.

The square root of 166645245 is about 12909.1148031149. The cubic root of 166645245 is about 550.2976295439.

The spelling of 166645245 in words is "one hundred sixty-six million, six hundred forty-five thousand, two hundred forty-five".