1669400809 has 8 divisors (see below), whose sum is σ = 1724725760. Its totient is φ = 1614168000.

The previous prime is 1669400807. The next prime is 1669400861. The reversal of 1669400809 is 9080049661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1669400809 - 2¹ = 1669400807 is a prime.

It is a super-2 number, since 2×1669400809² = 5573798122179708962, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1669400801) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14812 + ... + 59650.

It is an arithmetic number, because the mean of its divisors is an integer number (215590720).

Almost surely, 2^1669400809 is an apocalyptic number.

It is an amenable number.

1669400809 is a deficient number, since it is larger than the sum of its proper divisors (55324951).

1669400809 is a wasteful number, since it uses less digits than its factorization.

1669400809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46071.

The product of its (nonzero) digits is 93312, while the sum is 43.

The square root of 1669400809 is about 40858.3015922101. The cubic root of 1669400809 is about 1186.2790841277.

The spelling of 1669400809 in words is "one billion, six hundred sixty-nine million, four hundred thousand, eight hundred nine".