1144643666 has 4 divisors (see below), whose sum is σ = 1716965502. Its totient is φ = 572321832.

The previous prime is 1144643663. The next prime is 1144643671. The reversal of 1144643666 is 6663464411.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 659719225 + 484924441 = 25685^2 + 22021^2 .

It is a super-2 number, since 2×1144643666² = 2620418244227839112, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1144643663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 286160915 + ... + 286160918.

Almost surely, 2^1144643666 is an apocalyptic number.

1144643666 is a deficient number, since it is larger than the sum of its proper divisors (572321836).

1144643666 is an equidigital number, since it uses as much as digits as its factorization.

1144643666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 572321835.

The product of its digits is 248832, while the sum is 41.

The square root of 1144643666 is about 33832.5829046498. The cubic root of 1144643666 is about 1046.0604197192.

The spelling of 1144643666 in words is "one billion, one hundred forty-four million, six hundred forty-three thousand, six hundred sixty-six".