680566951 has 2 divisors, whose sum is σ = 680566952. Its totient is φ = 680566950.

The previous prime is 680566927. The next prime is 680566961. The reversal of 680566951 is 159665086.

680566951 = T₂₁₂₉₉ + T₂₁₃₀₀ + T₂₁₃₀₁.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 680566951 - 2⁵ = 680566919 is a prime.

It is equal to p_35297884 and since 680566951 and 35297884 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (680566961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340283475 + 340283476.

It is an arithmetic number, because the mean of its divisors is an integer number (340283476).

Almost surely, 2^680566951 is an apocalyptic number.

680566951 is the 21301-st centered triangular number.

680566951 is a deficient number, since it is larger than the sum of its proper divisors (1).

680566951 is an equidigital number, since it uses as much as digits as its factorization.

680566951 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 388800, while the sum is 46.

The square root of 680566951 is about 26087.6781450554. The cubic root of 680566951 is about 879.6102574230.

The spelling of 680566951 in words is "six hundred eighty million, five hundred sixty-six thousand, nine hundred fifty-one".