166690545 has 48 divisors (see below), whose sum is σ = 318740352. Its totient is φ = 72864000.

The previous prime is 166690541. The next prime is 166690547. The reversal of 166690545 is 545096661.

It is not a de Polignac number, because 166690545 - 2² = 166690541 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 166690497 and 166690506.

It is not an unprimeable number, because it can be changed into a prime (166690541) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 54045 + ... + 57045.

It is an arithmetic number, because the mean of its divisors is an integer number (6640424).

Almost surely, 2^166690545 is an apocalyptic number.

166690545 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

166690545 is a deficient number, since it is larger than the sum of its proper divisors (152049807).

166690545 is a wasteful number, since it uses less digits than its factorization.

166690545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3062 (or 3039 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 42.

The square root of 166690545 is about 12910.8692581096. The cubic root of 166690545 is about 550.3474884006.

The spelling of 166690545 in words is "one hundred sixty-six million, six hundred ninety thousand, five hundred forty-five".