2166343901 has 2 divisors, whose sum is σ = 2166343902. Its totient is φ = 2166343900.

The previous prime is 2166343871. The next prime is 2166343909. The reversal of 2166343901 is 1093436612.

It is a happy number.

2166343901 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1644221401 + 522122500 = 40549^2 + 22850^2 .

It is a cyclic number.

It is not a de Polignac number, because 2166343901 - 2¹⁰ = 2166342877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2166343909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1083171950 + 1083171951.

It is an arithmetic number, because the mean of its divisors is an integer number (1083171951).

Almost surely, 2^2166343901 is an apocalyptic number.

It is an amenable number.

2166343901 is a deficient number, since it is larger than the sum of its proper divisors (1).

2166343901 is an equidigital number, since it uses as much as digits as its factorization.

2166343901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 35.

The square root of 2166343901 is about 46543.9996240117. Note that the first 3 decimals coincide. The cubic root of 2166343901 is about 1293.9250882517.

Adding to 2166343901 its sum of digits (35), we get a square (2166343936 = 46544²).

The spelling of 2166343901 in words is "two billion, one hundred sixty-six million, three hundred forty-three thousand, nine hundred one".