626686609 has 2 divisors, whose sum is σ = 626686610. Its totient is φ = 626686608.

The previous prime is 626686573. The next prime is 626686651. The reversal of 626686609 is 906686626.

It is a happy number.

626686609 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 541585984 + 85100625 = 23272^2 + 9225^2 .

It is a cyclic number.

It is not a de Polignac number, because 626686609 - 2²³ = 618298001 is a prime.

It is a super-2 number, since 2×626686609² = 785472211799837762, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (626683609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 313343304 + 313343305.

It is an arithmetic number, because the mean of its divisors is an integer number (313343305).

Almost surely, 2^626686609 is an apocalyptic number.

It is an amenable number.

626686609 is a deficient number, since it is larger than the sum of its proper divisors (1).

626686609 is an equidigital number, since it uses as much as digits as its factorization.

626686609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1119744, while the sum is 49.

The square root of 626686609 is about 25033.7094534550. The cubic root of 626686609 is about 855.7563654502.

The spelling of 626686609 in words is "six hundred twenty-six million, six hundred eighty-six thousand, six hundred nine".