686544499 has 4 divisors (see below), whose sum is σ = 722678440. Its totient is φ = 650410560.

The previous prime is 686544497. The next prime is 686544517. The reversal of 686544499 is 994445686.

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 686544499 - 2¹ = 686544497 is a prime.

It is a super-2 number, since 2×686544499² = 942686698214322002, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (686544497) 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, 18066942 + ... + 18066979.

It is an arithmetic number, because the mean of its divisors is an integer number (180669610).

Almost surely, 2^686544499 is an apocalyptic number.

686544499 is a deficient number, since it is larger than the sum of its proper divisors (36133941).

686544499 is a wasteful number, since it uses less digits than its factorization.

686544499 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36133940.

The product of its digits is 7464960, while the sum is 55.

The square root of 686544499 is about 26201.9941798330. The cubic root of 686544499 is about 882.1780153092.

It can be divided in two parts, 68654 and 4499, that added together give a triangular number (73153 = T₃₈₂).

The spelling of 686544499 in words is "six hundred eighty-six million, five hundred forty-four thousand, four hundred ninety-nine".