685670407 has 2 divisors, whose sum is σ = 685670408. Its totient is φ = 685670406.

The previous prime is 685670383. The next prime is 685670413. The reversal of 685670407 is 704076586.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-685670407 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (685670417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342835203 + 342835204.

It is an arithmetic number, because the mean of its divisors is an integer number (342835204).

Almost surely, 2^685670407 is an apocalyptic number.

685670407 is a deficient number, since it is larger than the sum of its proper divisors (1).

685670407 is an equidigital number, since it uses as much as digits as its factorization.

685670407 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 282240, while the sum is 43.

The square root of 685670407 is about 26185.3089918756. The cubic root of 685670407 is about 881.8034670076.

The spelling of 685670407 in words is "six hundred eighty-five million, six hundred seventy thousand, four hundred seven".