686477455 has 4 divisors (see below), whose sum is σ = 823772952. Its totient is φ = 549181960.

The previous prime is 686477443. The next prime is 686477489. The reversal of 686477455 is 554774686.

686477455 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 686477455 - 2¹⁹ = 685953167 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68647741 + ... + 68647750.

It is an arithmetic number, because the mean of its divisors is an integer number (205943238).

Almost surely, 2^686477455 is an apocalyptic number.

686477455 is a deficient number, since it is larger than the sum of its proper divisors (137295497).

686477455 is a wasteful number, since it uses less digits than its factorization.

686477455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137295496.

The product of its digits is 5644800, while the sum is 52.

The square root of 686477455 is about 26200.7147803261. The cubic root of 686477455 is about 882.1492982251.

The spelling of 686477455 in words is "six hundred eighty-six million, four hundred seventy-seven thousand, four hundred fifty-five".