1669373257 has 4 divisors (see below), whose sum is σ = 1672338960. Its totient is φ = 1666407556.

The previous prime is 1669373227. The next prime is 1669373263. The reversal of 1669373257 is 7523739661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 7523739661 = 39451 ⋅190711.

It is a cyclic number.

It is not a de Polignac number, because 1669373257 - 2⁷ = 1669373129 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1669373257.

It is not an unprimeable number, because it can be changed into a prime (1669373207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1482007 + ... + 1483132.

It is an arithmetic number, because the mean of its divisors is an integer number (418084740).

Almost surely, 2^1669373257 is an apocalyptic number.

It is an amenable number.

1669373257 is a deficient number, since it is larger than the sum of its proper divisors (2965703).

1669373257 is an equidigital number, since it uses as much as digits as its factorization.

1669373257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2965702.

The product of its digits is 1428840, while the sum is 49.

The square root of 1669373257 is about 40857.9644255560. The cubic root of 1669373257 is about 1186.2725579256.

The spelling of 1669373257 in words is "one billion, six hundred sixty-nine million, three hundred seventy-three thousand, two hundred fifty-seven".