1099666644 has 24 divisors (see below), whose sum is σ = 2567674368. Its totient is φ = 366300480.

The previous prime is 1099666643. The next prime is 1099666651. The reversal of 1099666644 is 4466669901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1099666643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13497 + ... + 48800.

It is an arithmetic number, because the mean of its divisors is an integer number (106986432).

Almost surely, 2^1099666644 is an apocalyptic number.

It is an amenable number.

1099666644 is an abundant number, since it is smaller than the sum of its proper divisors (1468007724).

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

1099666644 is a wasteful number, since it uses less digits than its factorization.

1099666644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63775 (or 63773 counting only the distinct ones).

The product of its (nonzero) digits is 1679616, while the sum is 51.

The square root of 1099666644 is about 33161.2219919592. The cubic root of 1099666644 is about 1032.1758271116.

The spelling of 1099666644 in words is "one billion, ninety-nine million, six hundred sixty-six thousand, six hundred forty-four".