666125101 has 4 divisors (see below), whose sum is σ = 669282304. Its totient is φ = 662967900.

The previous prime is 666125087. The next prime is 666125153. The reversal of 666125101 is 101521666.

666125101 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 101521666 = 2 ⋅50760833.

It is a cyclic number.

It is not a de Polignac number, because 666125101 - 2¹⁵ = 666092333 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 666125101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666120101) 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, 1578285 + ... + 1578706.

It is an arithmetic number, because the mean of its divisors is an integer number (167320576).

Almost surely, 2^666125101 is an apocalyptic number.

It is an amenable number.

666125101 is a deficient number, since it is larger than the sum of its proper divisors (3157203).

666125101 is a wasteful number, since it uses less digits than its factorization.

666125101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3157202.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 666125101 is about 25809.3994699606. The cubic root of 666125101 is about 873.3438500601.

Adding to 666125101 its reverse (101521666), we get a palindrome (767646767).

The spelling of 666125101 in words is "six hundred sixty-six million, one hundred twenty-five thousand, one hundred one".