685701172133 has 2 divisors, whose sum is σ = 685701172134. Its totient is φ = 685701172132.

The previous prime is 685701172103. The next prime is 685701172187. The reversal of 685701172133 is 331271107586.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 676509540004 + 9191632129 = 822502^2 + 95873^2 .

It is a cyclic number.

It is not a de Polignac number, because 685701172133 - 2²² = 685696977829 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (685701172103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342850586066 + 342850586067.

It is an arithmetic number, because the mean of its divisors is an integer number (342850586067).

Almost surely, 2^685701172133 is an apocalyptic number.

It is an amenable number.

685701172133 is a deficient number, since it is larger than the sum of its proper divisors (1).

685701172133 is an equidigital number, since it uses as much as digits as its factorization.

685701172133 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 211680, while the sum is 44.

The spelling of 685701172133 in words is "six hundred eighty-five billion, seven hundred one million, one hundred seventy-two thousand, one hundred thirty-three".