1662566399 has 12 divisors (see below), whose sum is σ = 1848957336. Its totient is φ = 1493193312.

The previous prime is 1662566393. The next prime is 1662566429. The reversal of 1662566399 is 9936652661.

It is not a de Polignac number, because 1662566399 - 2²⁴ = 1645789183 is a prime.

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 1662566399.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1662566393) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 126689 + ... + 139194.

It is an arithmetic number, because the mean of its divisors is an integer number (154079778).

Almost surely, 2^1662566399 is an apocalyptic number.

1662566399 is a deficient number, since it is larger than the sum of its proper divisors (186390937).

1662566399 is a wasteful number, since it uses less digits than its factorization.

1662566399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265946 (or 265933 counting only the distinct ones).

The product of its digits is 3149280, while the sum is 53.

The square root of 1662566399 is about 40774.5803044004. The cubic root of 1662566399 is about 1184.6580221087.

The spelling of 1662566399 in words is "one billion, six hundred sixty-two million, five hundred sixty-six thousand, three hundred ninety-nine".