661662444 has 12 divisors (see below), whose sum is σ = 1543879064. Its totient is φ = 220554144.

The previous prime is 661662439. The next prime is 661662473. The reversal of 661662444 is 444266166.

661662444 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (12).

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27569257 + ... + 27569280.

Almost surely, 2^661662444 is an apocalyptic number.

It is an amenable number.

661662444 is an abundant number, since it is smaller than the sum of its proper divisors (882216620).

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

661662444 is a wasteful number, since it uses less digits than its factorization.

661662444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55138544 (or 55138542 counting only the distinct ones).

The product of its digits is 165888, while the sum is 39.

The square root of 661662444 is about 25722.8000808621. The cubic root of 661662444 is about 871.3891771291.

The spelling of 661662444 in words is "six hundred sixty-one million, six hundred sixty-two thousand, four hundred forty-four".