1667664444 has 24 divisors (see below), whose sum is σ = 3996386128. Its totient is φ = 540864000.

The previous prime is 1667664433. The next prime is 1667664457. The reversal of 1667664444 is 4444667661.

It is a super-2 number, since 2×1667664444² = 5562209395563658272, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1667664393 and 1667664402.

It is a congruent number.

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, 1877557 + ... + 1878444.

Almost surely, 2^1667664444 is an apocalyptic number.

It is an amenable number.

1667664444 is an abundant number, since it is smaller than the sum of its proper divisors (2328721684).

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

1667664444 is a wasteful number, since it uses less digits than its factorization.

1667664444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3756045 (or 3756043 counting only the distinct ones).

The product of its digits is 2322432, while the sum is 48.

The square root of 1667664444 is about 40837.0474446917. The cubic root of 1667664444 is about 1185.8676534655.

The spelling of 1667664444 in words is "one billion, six hundred sixty-seven million, six hundred sixty-four thousand, four hundred forty-four".