626506561 has 2 divisors, whose sum is σ = 626506562. Its totient is φ = 626506560.

The previous prime is 626506537. The next prime is 626506567. The reversal of 626506561 is 165605626.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 501760000 + 124746561 = 22400^2 + 11169^2 .

It is a cyclic number.

It is not a de Polignac number, because 626506561 - 2²⁹ = 89635649 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 626506561.

It is not a weakly prime, because it can be changed into another prime (626506567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 313253280 + 313253281.

It is an arithmetic number, because the mean of its divisors is an integer number (313253281).

Almost surely, 2^626506561 is an apocalyptic number.

It is an amenable number.

626506561 is a deficient number, since it is larger than the sum of its proper divisors (1).

626506561 is an equidigital number, since it uses as much as digits as its factorization.

626506561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64800, while the sum is 37.

The square root of 626506561 is about 25030.1130840434. The cubic root of 626506561 is about 855.6744042393.

The spelling of 626506561 in words is "six hundred twenty-six million, five hundred six thousand, five hundred sixty-one".