1866169001 has 2 divisors, whose sum is σ = 1866169002. Its totient is φ = 1866169000.

The previous prime is 1866168977. The next prime is 1866169003. The reversal of 1866169001 is 1009616681.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1783795225 + 82373776 = 42235^2 + 9076^2 .

It is an emirp because it is prime and its reverse (1009616681) is a distict prime. It is also a bemirp because it and its reverse can be mirrored producing other two distinct primes, 1006919981 and 1899196001.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1866169001 is a prime.

Together with 1866169003, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1866169003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 933084500 + 933084501.

It is an arithmetic number, because the mean of its divisors is an integer number (933084501).

Almost surely, 2^1866169001 is an apocalyptic number.

It is an amenable number.

1866169001 is a deficient number, since it is larger than the sum of its proper divisors (1).

1866169001 is an equidigital number, since it uses as much as digits as its factorization.

1866169001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15552, while the sum is 38.

The square root of 1866169001 is about 43199.1782444990. The cubic root of 1866169001 is about 1231.1670684228.

The spelling of 1866169001 in words is "one billion, eight hundred sixty-six million, one hundred sixty-nine thousand, one".