166542890 has 8 divisors (see below), whose sum is σ = 299777220. Its totient is φ = 66617152.

The previous prime is 166542877. The next prime is 166542917. The reversal of 166542890 is 98245661.

It is a happy number.

166542890 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 165199609 + 1343281 = 12853^2 + 1159^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8327135 + ... + 8327154.

Almost surely, 2^166542890 is an apocalyptic number.

166542890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

166542890 is a deficient number, since it is larger than the sum of its proper divisors (133234330).

166542890 is a wasteful number, since it uses less digits than its factorization.

166542890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16654296.

The product of its (nonzero) digits is 103680, while the sum is 41.

The square root of 166542890 is about 12905.1497472908. The cubic root of 166542890 is about 550.1849405606.

The spelling of 166542890 in words is "one hundred sixty-six million, five hundred forty-two thousand, eight hundred ninety".