1668066701 has 4 divisors (see below), whose sum is σ = 1906361952. Its totient is φ = 1429771452.

The previous prime is 1668066683. The next prime is 1668066727. The reversal of 1668066701 is 1076608661.

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: 1076608661 = 1997 ⋅539113.

It is a cyclic number.

It is not a de Polignac number, because 1668066701 - 2⁶ = 1668066637 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 (1668062701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 119147615 + ... + 119147628.

It is an arithmetic number, because the mean of its divisors is an integer number (476590488).

Almost surely, 2^1668066701 is an apocalyptic number.

It is an amenable number.

1668066701 is a deficient number, since it is larger than the sum of its proper divisors (238295251).

1668066701 is an equidigital number, since it uses as much as digits as its factorization.

1668066701 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 238295250.

The product of its (nonzero) digits is 72576, while the sum is 41.

The square root of 1668066701 is about 40841.9722956666. The cubic root of 1668066701 is about 1185.9629934318.

The spelling of 1668066701 in words is "one billion, six hundred sixty-eight million, sixty-six thousand, seven hundred one".