100605661 has 8 divisors (see below), whose sum is σ = 108429944. Its totient is φ = 92793600.

The previous prime is 100605647. The next prime is 100605707. The reversal of 100605661 is 166506001.

It can be written as a sum of positive squares in 4 ways, for example, as 4761 + 100600900 = 69^2 + 10030^2 .

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 100605661 - 2⁵ = 100605629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100605601) 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, 21265 + ... + 25561.

It is an arithmetic number, because the mean of its divisors is an integer number (13553743).

Almost surely, 2^100605661 is an apocalyptic number.

It is an amenable number.

100605661 is a deficient number, since it is larger than the sum of its proper divisors (7824283).

100605661 is a wasteful number, since it uses less digits than its factorization.

100605661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6111.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 100605661 is about 10030.2373351781. The cubic root of 100605661 is about 465.0940743106.

The spelling of 100605661 in words is "one hundred million, six hundred five thousand, six hundred sixty-one".