1669273157 has 4 divisors (see below), whose sum is σ = 1685800716. Its totient is φ = 1652745600.

The previous prime is 1669273127. The next prime is 1669273159. The reversal of 1669273157 is 7513729661.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7513729661 = 487 ⋅15428603.

It can be written as a sum of positive squares in 2 ways, for example, as 1495059556 + 174213601 = 38666^2 + 13199^2 .

It is a cyclic number.

It is not a de Polignac number, because 1669273157 - 2⁸ = 1669272901 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1669273159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8263628 + ... + 8263829.

It is an arithmetic number, because the mean of its divisors is an integer number (421450179).

Almost surely, 2^1669273157 is an apocalyptic number.

It is an amenable number.

1669273157 is a deficient number, since it is larger than the sum of its proper divisors (16527559).

1669273157 is a wasteful number, since it uses less digits than its factorization.

1669273157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16527558.

The product of its digits is 476280, while the sum is 47.

The square root of 1669273157 is about 40856.7394318245. The cubic root of 1669273157 is about 1186.2488467801.

The spelling of 1669273157 in words is "one billion, six hundred sixty-nine million, two hundred seventy-three thousand, one hundred fifty-seven".