1666100701 has 4 divisors (see below), whose sum is σ = 1666957500. Its totient is φ = 1665243904.

The previous prime is 1666100687. The next prime is 1666100719. The reversal of 1666100701 is 1070016661.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1307907225 + 358193476 = 36165^2 + 18926^2 .

It is a cyclic number.

It is not a de Polignac number, because 1666100701 - 2⁵ = 1666100669 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 1666100701.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666104701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 425476 + ... + 429373.

It is an arithmetic number, because the mean of its divisors is an integer number (416739375).

Almost surely, 2^1666100701 is an apocalyptic number.

It is an amenable number.

1666100701 is a deficient number, since it is larger than the sum of its proper divisors (856799).

1666100701 is an equidigital number, since it uses as much as digits as its factorization.

1666100701 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 856798.

The product of its (nonzero) digits is 1512, while the sum is 28.

The square root of 1666100701 is about 40817.8968223499. The cubic root of 1666100701 is about 1185.4968810033.

The spelling of 1666100701 in words is "one billion, six hundred sixty-six million, one hundred thousand, seven hundred one".