101666090 has 8 divisors (see below), whose sum is σ = 182998980. Its totient is φ = 40666432.

The previous prime is 101666057. The next prime is 101666099. The reversal of 101666090 is 90666101.

It can be written as a sum of positive squares in 2 ways, for example, as 100020001 + 1646089 = 10001^2 + 1283^2 .

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

It is not an unprimeable number, because it can be changed into a prime (101666099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5083295 + ... + 5083314.

Almost surely, 2^101666090 is an apocalyptic number.

101666090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

101666090 is a deficient number, since it is larger than the sum of its proper divisors (81332890).

101666090 is a wasteful number, since it uses less digits than its factorization.

101666090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10166616.

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 101666090 is about 10082.9603787777. The cubic root of 101666090 is about 466.7224666837.

The spelling of 101666090 in words is "one hundred one million, six hundred sixty-six thousand, ninety".