100666651 has 4 divisors (see below), whose sum is σ = 100896400. Its totient is φ = 100436904.

The previous prime is 100666649. The next prime is 100666691. The reversal of 100666651 is 156666001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 156666001 = 19 ⋅8245579.

It is a cyclic number.

It is not a de Polignac number, because 100666651 - 2¹ = 100666649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100666691) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 114216 + ... + 115093.

It is an arithmetic number, because the mean of its divisors is an integer number (25224100).

Almost surely, 2^100666651 is an apocalyptic number.

100666651 is a deficient number, since it is larger than the sum of its proper divisors (229749).

100666651 is an equidigital number, since it uses as much as digits as its factorization.

100666651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229748.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 100666651 is about 10033.2771814597. The cubic root of 100666651 is about 465.1880397235.

The spelling of 100666651 in words is "one hundred million, six hundred sixty-six thousand, six hundred fifty-one".