1669591493279 has 4 divisors (see below), whose sum is σ = 1669644915600. Its totient is φ = 1669538070960.

The previous prime is 1669591493257. The next prime is 1669591493333. The reversal of 1669591493279 is 9723941959661.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1669591493279 - 2²⁰ = 1669590444703 is a prime.

It is a super-2 number, since 2×1669591493279² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1669591493239) 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, 26664254 + ... + 26726795.

It is an arithmetic number, because the mean of its divisors is an integer number (417411228900).

Almost surely, 2^{1669591493279} is an apocalyptic number.

1669591493279 is a deficient number, since it is larger than the sum of its proper divisors (53422321).

1669591493279 is an equidigital number, since it uses as much as digits as its factorization.

1669591493279 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53422320.

The product of its digits is 198404640, while the sum is 71.

The spelling of 1669591493279 in words is "one trillion, six hundred sixty-nine billion, five hundred ninety-one million, four hundred ninety-three thousand, two hundred seventy-nine".