1669957427 has 4 divisors (see below), whose sum is σ = 1690077480. Its totient is φ = 1649837376.

The previous prime is 1669957403. The next prime is 1669957433. The reversal of 1669957427 is 7247599661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7247599661 = 25889 ⋅279949.

It is a cyclic number.

It is not a de Polignac number, because 1669957427 - 2⁶ = 1669957363 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1669957727) 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, 10059902 + ... + 10060067.

It is an arithmetic number, because the mean of its divisors is an integer number (422519370).

Almost surely, 2^1669957427 is an apocalyptic number.

1669957427 is a deficient number, since it is larger than the sum of its proper divisors (20120053).

1669957427 is an equidigital number, since it uses as much as digits as its factorization.

1669957427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20120052.

The product of its digits is 5715360, while the sum is 56.

The square root of 1669957427 is about 40865.1125900810. The cubic root of 1669957427 is about 1186.4109140462.

The spelling of 1669957427 in words is "one billion, six hundred sixty-nine million, nine hundred fifty-seven thousand, four hundred twenty-seven".