1666652107 has 4 divisors (see below), whose sum is σ = 1667128176. Its totient is φ = 1666176040.

The previous prime is 1666652047. The next prime is 1666652147. The reversal of 1666652107 is 7012566661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7012566661 = 73 ⋅96062557.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1666652107 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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 1666652107.

It is not an unprimeable number, because it can be changed into a prime (1666652147) 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, 232744 + ... + 239797.

It is an arithmetic number, because the mean of its divisors is an integer number (416782044).

Almost surely, 2^1666652107 is an apocalyptic number.

1666652107 is a deficient number, since it is larger than the sum of its proper divisors (476069).

1666652107 is an equidigital number, since it uses as much as digits as its factorization.

1666652107 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 476068.

The product of its (nonzero) digits is 90720, while the sum is 40.

The square root of 1666652107 is about 40824.6507272261. The cubic root of 1666652107 is about 1185.6276490079.

The spelling of 1666652107 in words is "one billion, six hundred sixty-six million, six hundred fifty-two thousand, one hundred seven".