1669993646 has 8 divisors (see below), whose sum is σ = 2507836464. Its totient is φ = 834048160.

The previous prime is 1669993609. The next prime is 1669993649. The reversal of 1669993646 is 6463999661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1669993649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 472130 + ... + 475653.

It is an arithmetic number, because the mean of its divisors is an integer number (313479558).

Almost surely, 2^1669993646 is an apocalyptic number.

1669993646 is a deficient number, since it is larger than the sum of its proper divisors (837842818).

1669993646 is an equidigital number, since it uses as much as digits as its factorization.

1669993646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 948666.

The product of its digits is 11337408, while the sum is 59.

The square root of 1669993646 is about 40865.5557407458. Note that the first 3 decimals coincide. The cubic root of 1669993646 is about 1186.4194911723.

The spelling of 1669993646 in words is "one billion, six hundred sixty-nine million, nine hundred ninety-three thousand, six hundred forty-six".