685664548471 has 32 divisors (see below), whose sum is σ = 831354257408. Its totient is φ = 552984174720.

The previous prime is 685664548469. The next prime is 685664548501. The reversal of 685664548471 is 174845466586.

It is a cyclic number.

It is not a de Polignac number, because 685664548471 - 2¹ = 685664548469 is a prime.

It is a super-3 number, since 3×685664548471³ (a number of 36 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685664548171) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11395261 + ... + 11455273.

It is an arithmetic number, because the mean of its divisors is an integer number (25979820544).

Almost surely, 2^685664548471 is an apocalyptic number.

685664548471 is a deficient number, since it is larger than the sum of its proper divisors (145689708937).

685664548471 is a wasteful number, since it uses less digits than its factorization.

685664548471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61511.

The product of its digits is 154828800, while the sum is 64.

The spelling of 685664548471 in words is "six hundred eighty-five billion, six hundred sixty-four million, five hundred forty-eight thousand, four hundred seventy-one".