669541968 has 120 divisors (see below), whose sum is σ = 1951113216. Its totient is φ = 214099200.

The previous prime is 669541967. The next prime is 669541997. The reversal of 669541968 is 869145966.

It is a happy number.

669541968 is a `hidden beast` number, since 6 + 6 + 9 + 541 + 96 + 8 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669541967) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 566338 + ... + 567518.

Almost surely, 2^669541968 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 669541968, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (975556608).

669541968 is an abundant number, since it is smaller than the sum of its proper divisors (1281571248).

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

669541968 is a wasteful number, since it uses less digits than its factorization.

669541968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1353 (or 1344 counting only the distinct ones).

The product of its digits is 2799360, while the sum is 54.

The square root of 669541968 is about 25875.5090384711. The cubic root of 669541968 is about 874.8345670371.

The spelling of 669541968 in words is "six hundred sixty-nine million, five hundred forty-one thousand, nine hundred sixty-eight".