166890639 has 8 divisors (see below), whose sum is σ = 229699072. Its totient is φ = 107671320.

The previous prime is 166890637. The next prime is 166890641. The reversal of 166890639 is 936098661.

It is an interprime number because it is at equal distance from previous prime (166890637) and next prime (166890641).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 166890639 - 2¹ = 166890637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166890631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 897169 + ... + 897354.

It is an arithmetic number, because the mean of its divisors is an integer number (28712384).

Almost surely, 2^166890639 is an apocalyptic number.

166890639 is a deficient number, since it is larger than the sum of its proper divisors (62808433).

166890639 is a wasteful number, since it uses less digits than its factorization.

166890639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1794557.

The product of its (nonzero) digits is 419904, while the sum is 48.

The square root of 166890639 is about 12918.6159862425. The cubic root of 166890639 is about 550.5676112572.

The spelling of 166890639 in words is "one hundred sixty-six million, eight hundred ninety thousand, six hundred thirty-nine".