1669604193947 has 2 divisors, whose sum is σ = 1669604193948. Its totient is φ = 1669604193946.

The previous prime is 1669604193883. The next prime is 1669604193991. The reversal of 1669604193947 is 7493914069661.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1669604193947 - 2⁶ = 1669604193883 is a prime.

It is not a weakly prime, because it can be changed into another prime (1669604193997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 834802096973 + 834802096974.

It is an arithmetic number, because the mean of its divisors is an integer number (834802096974).

Almost surely, 2^{1669604193947} is an apocalyptic number.

1669604193947 is a deficient number, since it is larger than the sum of its proper divisors (1).

1669604193947 is an equidigital number, since it uses as much as digits as its factorization.

1669604193947 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 52907904, while the sum is 65.

The spelling of 1669604193947 in words is "one trillion, six hundred sixty-nine billion, six hundred four million, one hundred ninety-three thousand, nine hundred forty-seven".