685865662453 has 4 divisors (see below), whose sum is σ = 685918674828. Its totient is φ = 685812650080.

The previous prime is 685865662451. The next prime is 685865662457. The reversal of 685865662453 is 354266568586.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 484725073284 + 201140589169 = 696222^2 + 448487^2 .

It is a cyclic number.

It is not a de Polignac number, because 685865662453 - 2¹ = 685865662451 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685865662451) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26486776 + ... + 26512657.

It is an arithmetic number, because the mean of its divisors is an integer number (171479668707).

Almost surely, 2^685865662453 is an apocalyptic number.

It is an amenable number.

685865662453 is a deficient number, since it is larger than the sum of its proper divisors (53012375).

685865662453 is a wasteful number, since it uses less digits than its factorization.

685865662453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53012374.

The product of its digits is 248832000, while the sum is 64.

The spelling of 685865662453 in words is "six hundred eighty-five billion, eight hundred sixty-five million, six hundred sixty-two thousand, four hundred fifty-three".