626768305969 has 9 divisors (see below), whose sum is σ = 678701085483. Its totient is φ = 578545859112.

The previous prime is 626768305939. The next prime is 626768305979. The reversal of 626768305969 is 969503867626.

The square root of 626768305969 is 791687.

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

It can be written as a sum of positive squares in only one way, i.e., 92717205025 + 534051100944 = 304495^2 + 730788^2 .

It is not a de Polignac number, because 626768305969 - 2¹⁷ = 626768174897 is a prime.

It is a super-2 number, since 2×626768305969² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (626768305939) 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, 10261482 + ... + 10322380.

Almost surely, 2^626768305969 is an apocalyptic number.

626768305969 is the 791687-th square number.

626768305969 is the 395844-th centered octagonal number.

It is an amenable number.

626768305969 is a deficient number, since it is larger than the sum of its proper divisors (51932779514).

626768305969 is an frugal number, since it uses more digits than its factorization.

626768305969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121824 (or 60912 counting only the distinct ones).

The product of its (nonzero) digits is 176359680, while the sum is 67.

The spelling of 626768305969 in words is "six hundred twenty-six billion, seven hundred sixty-eight million, three hundred five thousand, nine hundred sixty-nine".