685156455 has 16 divisors (see below), whose sum is σ = 1218056160. Its totient is φ = 365416704.

The previous prime is 685156447. The next prime is 685156471. The reversal of 685156455 is 554651586.

685156455 is a `hidden beast` number, since 6 + 85 + 1 + 564 + 5 + 5 = 666.

685156455 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 685156455 - 2³ = 685156447 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 685156455.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2537482 + ... + 2537751.

It is an arithmetic number, because the mean of its divisors is an integer number (76128510).

Almost surely, 2^685156455 is an apocalyptic number.

685156455 is a deficient number, since it is larger than the sum of its proper divisors (532899705).

685156455 is a wasteful number, since it uses less digits than its factorization.

685156455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5075247 (or 5075241 counting only the distinct ones).

The product of its digits is 720000, while the sum is 45.

The square root of 685156455 is about 26175.4934050917. The cubic root of 685156455 is about 881.5830900194.

The spelling of 685156455 in words is "six hundred eighty-five million, one hundred fifty-six thousand, four hundred fifty-five".