101666645 has 8 divisors (see below), whose sum is σ = 122101560. Its totient is φ = 81265600.

The previous prime is 101666629. The next prime is 101666651. The reversal of 101666645 is 546666101.

It can be written as a sum of positive squares in 4 ways, for example, as 10387729 + 91278916 = 3223^2 + 9554^2 .

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

It is not a de Polignac number, because 101666645 - 2⁴ = 101666629 is a prime.

It is a super-2 number, since 2×101666645² = 20672213411112050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1310 + ... + 14319.

It is an arithmetic number, because the mean of its divisors is an integer number (15262695).

Almost surely, 2^101666645 is an apocalyptic number.

It is an amenable number.

101666645 is a deficient number, since it is larger than the sum of its proper divisors (20434915).

101666645 is a wasteful number, since it uses less digits than its factorization.

101666645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16935.

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 101666645 is about 10082.9879004192. The cubic root of 101666645 is about 466.7233159688.

The spelling of 101666645 in words is "one hundred one million, six hundred sixty-six thousand, six hundred forty-five".