1661668301 has 2 divisors, whose sum is σ = 1661668302. Its totient is φ = 1661668300.

The previous prime is 1661668291. The next prime is 1661668343. The reversal of 1661668301 is 1038661661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1169982025 + 491686276 = 34205^2 + 22174^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1661668301 is a prime.

It is a super-2 number, since 2×1661668301² = 5522283085096453202, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1661668201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 830834150 + 830834151.

It is an arithmetic number, because the mean of its divisors is an integer number (830834151).

Almost surely, 2^1661668301 is an apocalyptic number.

It is an amenable number.

1661668301 is a deficient number, since it is larger than the sum of its proper divisors (1).

1661668301 is an equidigital number, since it uses as much as digits as its factorization.

1661668301 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 1661668301 is about 40763.5658523638. The cubic root of 1661668301 is about 1184.4446711043. Note that the first 3 decimals are identical.

The spelling of 1661668301 in words is "one billion, six hundred sixty-one million, six hundred sixty-eight thousand, three hundred one".