680427557 has 2 divisors, whose sum is σ = 680427558. Its totient is φ = 680427556.

The previous prime is 680427547. The next prime is 680427623. The reversal of 680427557 is 755724086.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 456206881 + 224220676 = 21359^2 + 14974^2 .

It is a cyclic number.

It is not a de Polignac number, because 680427557 - 2¹⁶ = 680362021 is a prime.

It is a super-3 number, since 3×680427557³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (680427547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340213778 + 340213779.

It is an arithmetic number, because the mean of its divisors is an integer number (340213779).

Almost surely, 2^680427557 is an apocalyptic number.

It is an amenable number.

680427557 is a deficient number, since it is larger than the sum of its proper divisors (1).

680427557 is an equidigital number, since it uses as much as digits as its factorization.

680427557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 470400, while the sum is 44.

The square root of 680427557 is about 26085.0063638098. The cubic root of 680427557 is about 879.5501992787.

The spelling of 680427557 in words is "six hundred eighty million, four hundred twenty-seven thousand, five hundred fifty-seven".