1669669079 has 4 divisors (see below), whose sum is σ = 1798105176. Its totient is φ = 1541232984.

The previous prime is 1669669073. The next prime is 1669669081. The reversal of 1669669079 is 9709669661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9709669661 = 41351 ⋅234811.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1669669079 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 (1669669073) 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, 64218029 + ... + 64218054.

It is an arithmetic number, because the mean of its divisors is an integer number (449526294).

Almost surely, 2^1669669079 is an apocalyptic number.

1669669079 is a deficient number, since it is larger than the sum of its proper divisors (128436097).

1669669079 is a wasteful number, since it uses less digits than its factorization.

1669669079 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128436096.

The product of its (nonzero) digits is 6613488, while the sum is 59.

The square root of 1669669079 is about 40861.5843916997. The cubic root of 1669669079 is about 1186.3426250985.

The spelling of 1669669079 in words is "one billion, six hundred sixty-nine million, six hundred sixty-nine thousand, seventy-nine".