1042664643 has 28 divisors (see below), whose sum is σ = 1588977168. Its totient is φ = 683685360.

The previous prime is 1042664627. The next prime is 1042664647. The reversal of 1042664643 is 3464662401.

1042664643 is a `hidden beast` number, since 1 + 0 + 4 + 2 + 6 + 6 + 4 + 643 = 666.

It is not a de Polignac number, because 1042664643 - 2⁴ = 1042664627 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1042664598 and 1042664607.

It is not an unprimeable number, because it can be changed into a prime (1042664647) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 32746 + ... + 56192.

Almost surely, 2^1042664643 is an apocalyptic number.

1042664643 is a deficient number, since it is larger than the sum of its proper divisors (546312525).

1042664643 is an frugal number, since it uses more digits than its factorization.

1042664643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23526 (or 23511 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 36.

The square root of 1042664643 is about 32290.3181000126. The cubic root of 1042664643 is about 1014.0239569285.

The spelling of 1042664643 in words is "one billion, forty-two million, six hundred sixty-four thousand, six hundred forty-three".