685121272523 has 4 divisors (see below), whose sum is σ = 685123338648. Its totient is φ = 685119206400.

The previous prime is 685121272487. The next prime is 685121272547. The reversal of 685121272523 is 325272121586.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 685121272523 - 2⁸ = 685121272267 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (685141272523) 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, 410678 + ... + 1240523.

It is an arithmetic number, because the mean of its divisors is an integer number (171280834662).

Almost surely, 2^685121272523 is an apocalyptic number.

685121272523 is a deficient number, since it is larger than the sum of its proper divisors (2066125).

685121272523 is a wasteful number, since it uses less digits than its factorization.

685121272523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2066124.

The product of its digits is 403200, while the sum is 44.

The spelling of 685121272523 in words is "six hundred eighty-five billion, one hundred twenty-one million, two hundred seventy-two thousand, five hundred twenty-three".