1066649644 has 6 divisors (see below), whose sum is σ = 1866636884. Its totient is φ = 533324820.

The previous prime is 1066649629. The next prime is 1066649651. The reversal of 1066649644 is 4469466601.

It is a super-2 number, since 2×1066649644² = 2275482926090653472, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1066649594 and 1066649603.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133331202 + ... + 133331209.

Almost surely, 2^1066649644 is an apocalyptic number.

It is an amenable number.

1066649644 is a deficient number, since it is larger than the sum of its proper divisors (799987240).

1066649644 is a wasteful number, since it uses less digits than its factorization.

1066649644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266662415 (or 266662413 counting only the distinct ones).

The product of its (nonzero) digits is 746496, while the sum is 46.

The square root of 1066649644 is about 32659.6026307731. The cubic root of 1066649644 is about 1021.7404745666.

The spelling of 1066649644 in words is "one billion, sixty-six million, six hundred forty-nine thousand, six hundred forty-four".