1669921027 has 2 divisors, whose sum is σ = 1669921028. Its totient is φ = 1669921026.

The previous prime is 1669921013. The next prime is 1669921061. The reversal of 1669921027 is 7201299661.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1669921027 is a prime.

It is not a weakly prime, because it can be changed into another prime (1669921927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 834960513 + 834960514.

It is an arithmetic number, because the mean of its divisors is an integer number (834960514).

Almost surely, 2^1669921027 is an apocalyptic number.

1669921027 is a deficient number, since it is larger than the sum of its proper divisors (1).

1669921027 is an equidigital number, since it uses as much as digits as its factorization.

1669921027 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81648, while the sum is 43.

The square root of 1669921027 is about 40864.6672199836. The cubic root of 1669921027 is about 1186.4022939320.

The spelling of 1669921027 in words is "one billion, six hundred sixty-nine million, nine hundred twenty-one thousand, twenty-seven".