617646669025 has 9 divisors (see below), whose sum is σ = 765886742233. Its totient is φ = 494114191600.

The previous prime is 617646669011. The next prime is 617646669089. The reversal of 617646669025 is 520966646716.

It is a happy number.

The square root of 617646669025 is 785905.

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 127568265889 + 490078403136 = 357167^2 + 700056^2 .

It is not a de Polignac number, because 617646669025 - 2⁵ = 617646668993 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 3850935 + ... + 4008115.

Almost surely, 2^617646669025 is an apocalyptic number.

617646669025 is the 785905-th square number.

617646669025 is the 392953-rd centered octagonal number.

It is an amenable number.

617646669025 is a deficient number, since it is larger than the sum of its proper divisors (148240073208).

617646669025 is an frugal number, since it uses more digits than its factorization.

617646669025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 314372 (or 157186 counting only the distinct ones).

The product of its (nonzero) digits is 19595520, while the sum is 58.

The spelling of 617646669025 in words is "six hundred seventeen billion, six hundred forty-six million, six hundred sixty-nine thousand, twenty-five".