16666490 has 32 divisors (see below), whose sum is σ = 31539456. Its totient is φ = 6328960.

The previous prime is 16666487. The next prime is 16666493. The reversal of 16666490 is 9466661.

16666490 = 1173² + 1174² + ... + 1184².

It is an interprime number because it is at equal distance from previous prime (16666487) and next prime (16666493).

It is not an unprimeable number, because it can be changed into a prime (16666493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53435 + ... + 53745.

It is an arithmetic number, because the mean of its divisors is an integer number (985608).

Almost surely, 2^16666490 is an apocalyptic number.

16666490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

16666490 is a deficient number, since it is larger than the sum of its proper divisors (14872966).

16666490 is a wasteful number, since it uses less digits than its factorization.

16666490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 574.

The product of its (nonzero) digits is 46656, while the sum is 38.

The square root of 16666490 is about 4082.4612674219. The cubic root of 16666490 is about 255.4355749191.

The spelling of 16666490 in words is "sixteen million, six hundred sixty-six thousand, four hundred ninety".