669544842 has 16 divisors (see below), whose sum is σ = 1371750912. Its totient is φ = 217738080.

The previous prime is 669544793. The next prime is 669544871. The reversal of 669544842 is 248445966.

669544842 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 669544791 and 669544800.

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, 1360618 + ... + 1361109.

It is an arithmetic number, because the mean of its divisors is an integer number (85734432).

Almost surely, 2^669544842 is an apocalyptic number.

669544842 is an abundant number, since it is smaller than the sum of its proper divisors (702206070).

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

669544842 is a wasteful number, since it uses less digits than its factorization.

669544842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2721773.

The product of its digits is 1658880, while the sum is 48.

The square root of 669544842 is about 25875.5645735509. The cubic root of 669544842 is about 874.8358187739.

The spelling of 669544842 in words is "six hundred sixty-nine million, five hundred forty-four thousand, eight hundred forty-two".