101666649 has 16 divisors (see below), whose sum is σ = 155105280. Its totient is φ = 58026000.

The previous prime is 101666629. The next prime is 101666651. The reversal of 101666649 is 946666101.

It is not a de Polignac number, because 101666649 - 2⁸ = 101666393 is a prime.

It is a super-2 number, since 2×101666649² = 20672215037778402, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (101666629) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19024 + ... + 23774.

It is an arithmetic number, because the mean of its divisors is an integer number (9694080).

Almost surely, 2^101666649 is an apocalyptic number.

It is an amenable number.

101666649 is a deficient number, since it is larger than the sum of its proper divisors (53438631).

101666649 is a wasteful number, since it uses less digits than its factorization.

101666649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5780.

The product of its (nonzero) digits is 46656, while the sum is 39.

The square root of 101666649 is about 10082.9880987731. The cubic root of 101666649 is about 466.7233220898.

The spelling of 101666649 in words is "one hundred one million, six hundred sixty-six thousand, six hundred forty-nine".