612440663 has 4 divisors (see below), whose sum is σ = 612595680. Its totient is φ = 612285648.

The previous prime is 612440659. The next prime is 612440683. The reversal of 612440663 is 366044216.

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

It is a cyclic number.

It is not a de Polignac number, because 612440663 - 2² = 612440659 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (612440683) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71423 + ... + 79536.

It is an arithmetic number, because the mean of its divisors is an integer number (153148920).

Almost surely, 2^612440663 is an apocalyptic number.

612440663 is a deficient number, since it is larger than the sum of its proper divisors (155017).

612440663 is a wasteful number, since it uses less digits than its factorization.

612440663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155016.

The product of its (nonzero) digits is 20736, while the sum is 32.

The square root of 612440663 is about 24747.5385240634. The cubic root of 612440663 is about 849.2222010584. Note that the first 4 decimals are identical.

Adding to 612440663 its reverse (366044216), we get a palindrome (978484879).

The spelling of 612440663 in words is "six hundred twelve million, four hundred forty thousand, six hundred sixty-three".