1666469904 has 40 divisors (see below), whose sum is σ = 4696416672. Its totient is φ = 504990720.

The previous prime is 1666469747. The next prime is 1666469911. The reversal of 1666469904 is 4099646661.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1577569 + ... + 1578624.

Almost surely, 2^1666469904 is an apocalyptic number.

It is an amenable number.

1666469904 is an abundant number, since it is smaller than the sum of its proper divisors (3029946768).

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

1666469904 is a wasteful number, since it uses less digits than its factorization.

1666469904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3156215 (or 3156209 counting only the distinct ones).

The product of its (nonzero) digits is 1679616, while the sum is 51.

The square root of 1666469904 is about 40822.4191345883. The cubic root of 1666469904 is about 1185.5844420730.

It can be divided in two parts, 16664 and 69904, that added together give a palindrome (86568).

The spelling of 1666469904 in words is "one billion, six hundred sixty-six million, four hundred sixty-nine thousand, nine hundred four".