1669544979 has 4 divisors (see below), whose sum is σ = 2226059976. Its totient is φ = 1113029984.

The previous prime is 1669544923. The next prime is 1669545001. The reversal of 1669544979 is 9794459661.

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 1669544979 - 2¹² = 1669540883 is a prime.

It is a super-2 number, since 2×1669544979² = 5574760873808220882, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1669544909) 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, 278257494 + ... + 278257499.

It is an arithmetic number, because the mean of its divisors is an integer number (556514994).

Almost surely, 2^1669544979 is an apocalyptic number.

1669544979 is a deficient number, since it is larger than the sum of its proper divisors (556514997).

1669544979 is an equidigital number, since it uses as much as digits as its factorization.

1669544979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 556514996.

The product of its digits is 14696640, while the sum is 60.

The square root of 1669544979 is about 40860.0658222671. The cubic root of 1669544979 is about 1186.3132322946.

The spelling of 1669544979 in words is "one billion, six hundred sixty-nine million, five hundred forty-four thousand, nine hundred seventy-nine".