680768768786 has 4 divisors (see below), whose sum is σ = 1021153153182. Its totient is φ = 340384384392.

The previous prime is 680768768777. The next prime is 680768768789. The reversal of 680768768786 is 687867867086.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 467403301561 + 213365467225 = 683669^2 + 461915^2 .

It is a super-2 number, since 2×680768768786² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (680768768789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 170192192195 + ... + 170192192198.

Almost surely, 2^680768768786 is an apocalyptic number.

680768768786 is a deficient number, since it is larger than the sum of its proper divisors (340384384396).

680768768786 is a wasteful number, since it uses less digits than its factorization.

680768768786 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340384384395.

The product of its (nonzero) digits is 1820786688, while the sum is 77.

The spelling of 680768768786 in words is "six hundred eighty billion, seven hundred sixty-eight million, seven hundred sixty-eight thousand, seven hundred eighty-six".