626239570609 has 9 divisors (see below), whose sum is σ = 636723172449. Its totient is φ = 615925866960.

The previous prime is 626239570529. The next prime is 626239570633. The reversal of 626239570609 is 906075932626.

The square root of 626239570609 is 791353.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 589862400625 + 36377169984 = 768025^2 + 190728^2 .

It is not a de Polignac number, because 626239570609 - 2⁹ = 626239570097 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 626239570609.

It is not an unprimeable number, because it can be changed into a prime (626239570669) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 48266047 + ... + 48279019.

It is an arithmetic number, because the mean of its divisors is an integer number (70747019161).

Almost surely, 2^626239570609 is an apocalyptic number.

626239570609 is the 791353-rd square number.

626239570609 is the 395677-th centered octagonal number.

It is an amenable number.

626239570609 is a deficient number, since it is larger than the sum of its proper divisors (10483601840).

626239570609 is an frugal number, since it uses more digits than its factorization.

626239570609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26068 (or 13034 counting only the distinct ones).

The product of its (nonzero) digits is 7348320, while the sum is 55.

The spelling of 626239570609 in words is "six hundred twenty-six billion, two hundred thirty-nine million, five hundred seventy thousand, six hundred nine".