661345612 has 12 divisors (see below), whose sum is σ = 1169287000. Its totient is φ = 327263616.

The previous prime is 661345567. The next prime is 661345627. The reversal of 661345612 is 216543166.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 851862 + ... + 852637.

Almost surely, 2^661345612 is an apocalyptic number.

It is an amenable number.

661345612 is a deficient number, since it is larger than the sum of its proper divisors (507941388).

661345612 is a wasteful number, since it uses less digits than its factorization.

661345612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1704600 (or 1704598 counting only the distinct ones).

The product of its digits is 25920, while the sum is 34.

The square root of 661345612 is about 25716.6407604104. The cubic root of 661345612 is about 871.2500689091.

Adding to 661345612 its reverse (216543166), we get a palindrome (877888778).

It can be divided in two parts, 6613 and 45612, that added together give a palindrome (52225).

The spelling of 661345612 in words is "six hundred sixty-one million, three hundred forty-five thousand, six hundred twelve".