626665643 has 8 divisors (see below), whose sum is σ = 634233600. Its totient is φ = 619109568.

The previous prime is 626665603. The next prime is 626665649. The reversal of 626665643 is 346566626.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 626665643 - 2⁶ = 626665579 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 626665594 and 626665603.

It is not an unprimeable number, because it can be changed into a prime (626665649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 148598 + ... + 152756.

It is an arithmetic number, because the mean of its divisors is an integer number (79279200).

Almost surely, 2^626665643 is an apocalyptic number.

626665643 is a deficient number, since it is larger than the sum of its proper divisors (7567957).

626665643 is a wasteful number, since it uses less digits than its factorization.

626665643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5941.

The product of its digits is 933120, while the sum is 44.

The square root of 626665643 is about 25033.2906945931. The cubic root of 626665643 is about 855.7468221433.

The spelling of 626665643 in words is "six hundred twenty-six million, six hundred sixty-five thousand, six hundred forty-three".