680217757 has 4 divisors (see below), whose sum is σ = 696808476. Its totient is φ = 663627040.

The previous prime is 680217749. The next prime is 680217809. The reversal of 680217757 is 757712086.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 757712086 = 2 ⋅378856043.

It can be written as a sum of positive squares in 2 ways, for example, as 278856601 + 401361156 = 16699^2 + 20034^2 .

It is a cyclic number.

It is not a de Polignac number, because 680217757 - 2³ = 680217749 is a prime.

It is a super-2 number, since 2×680217757² = 925392393876222098, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (680217257) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8295298 + ... + 8295379.

It is an arithmetic number, because the mean of its divisors is an integer number (174202119).

Almost surely, 2^680217757 is an apocalyptic number.

It is an amenable number.

680217757 is a deficient number, since it is larger than the sum of its proper divisors (16590719).

680217757 is a wasteful number, since it uses less digits than its factorization.

680217757 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16590718.

The product of its (nonzero) digits is 164640, while the sum is 43.

The square root of 680217757 is about 26080.9845864760. The cubic root of 680217757 is about 879.4597911234.

The spelling of 680217757 in words is "six hundred eighty million, two hundred seventeen thousand, seven hundred fifty-seven".