669126144 has 80 divisors (see below), whose sum is σ = 1788956928. Its totient is φ = 222246912.

The previous prime is 669126131. The next prime is 669126197. The reversal of 669126144 is 441621966.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 563119 + ... + 564305.

Almost surely, 2^669126144 is an apocalyptic number.

669126144 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 669126144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (894478464).

669126144 is an abundant number, since it is smaller than the sum of its proper divisors (1119830784).

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

669126144 is a wasteful number, since it uses less digits than its factorization.

669126144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1575 (or 1559 counting only the distinct ones).

The product of its digits is 62208, while the sum is 39.

The square root of 669126144 is about 25867.4727022181. The cubic root of 669126144 is about 874.6534220349.

The spelling of 669126144 in words is "six hundred sixty-nine million, one hundred twenty-six thousand, one hundred forty-four".