101666489 has 8 divisors (see below), whose sum is σ = 105485760. Its totient is φ = 97868176.

The previous prime is 101666483. The next prime is 101666501. The reversal of 101666489 is 984666101.

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

It is a cyclic number.

It is not a de Polignac number, because 101666489 - 2¹⁶ = 101600953 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (101666483) 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, 5012 + ... + 15114.

It is an arithmetic number, because the mean of its divisors is an integer number (13185720).

Almost surely, 2^101666489 is an apocalyptic number.

It is an amenable number.

101666489 is a deficient number, since it is larger than the sum of its proper divisors (3819271).

101666489 is a wasteful number, since it uses less digits than its factorization.

101666489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10479.

The product of its (nonzero) digits is 62208, while the sum is 41.

The square root of 101666489 is about 10082.9801646140. The cubic root of 101666489 is about 466.7230772511.

The spelling of 101666489 in words is "one hundred one million, six hundred sixty-six thousand, four hundred eighty-nine".