626245561 has 4 divisors (see below), whose sum is σ = 634172800. Its totient is φ = 618318324.

The previous prime is 626245547. The next prime is 626245573. The reversal of 626245561 is 165542626.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 626245561 - 2¹⁵ = 626212793 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 626245561.

It is not an unprimeable number, because it can be changed into a prime (626245591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3963501 + ... + 3963658.

It is an arithmetic number, because the mean of its divisors is an integer number (158543200).

Almost surely, 2^626245561 is an apocalyptic number.

It is an amenable number.

626245561 is a deficient number, since it is larger than the sum of its proper divisors (7927239).

626245561 is an equidigital number, since it uses as much as digits as its factorization.

626245561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7927238.

The product of its digits is 86400, while the sum is 37.

The square root of 626245561 is about 25024.8988209743. The cubic root of 626245561 is about 855.5555642817. Note that the first 4 decimals are identical.

The spelling of 626245561 in words is "six hundred twenty-six million, two hundred forty-five thousand, five hundred sixty-one".