1669047666 has 128 divisors (see below), whose sum is σ = 4225858560. Its totient is φ = 431827200.

The previous prime is 1669047661. The next prime is 1669047671. The reversal of 1669047666 is 6667409661.

It is an interprime number because it is at equal distance from previous prime (1669047661) and next prime (1669047671).

It is a super-2 number, since 2×1669047666² = 5571440222760095112, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1669047661) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 699796 + ... + 702176.

It is an arithmetic number, because the mean of its divisors is an integer number (33014520).

Almost surely, 2^1669047666 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1669047666, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2112929280).

1669047666 is an abundant number, since it is smaller than the sum of its proper divisors (2556810894).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1669047666 is a wasteful number, since it uses less digits than its factorization.

1669047666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2472.

The product of its (nonzero) digits is 1959552, while the sum is 51.

The square root of 1669047666 is about 40853.9798061339. The cubic root of 1669047666 is about 1186.1954302211.

The spelling of 1669047666 in words is "one billion, six hundred sixty-nine million, forty-seven thousand, six hundred sixty-six".