686153985 has 32 divisors (see below), whose sum is σ = 1198834560. Its totient is φ = 332352000.

The previous prime is 686153971. The next prime is 686153999. The reversal of 686153985 is 589351686.

It is an interprime number because it is at equal distance from previous prime (686153971) and next prime (686153999).

It is not a de Polignac number, because 686153985 - 2⁶ = 686153921 is a prime.

It is a super-2 number, since 2×686153985² = 941614582262760450, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 296011 + ... + 298319.

It is an arithmetic number, because the mean of its divisors is an integer number (37463580).

Almost surely, 2^686153985 is an apocalyptic number.

It is an amenable number.

686153985 is a deficient number, since it is larger than the sum of its proper divisors (512680575).

686153985 is a wasteful number, since it uses less digits than its factorization.

686153985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4129.

The product of its digits is 1555200, while the sum is 51.

The square root of 686153985 is about 26194.5411297850. The cubic root of 686153985 is about 882.0107194259.

The spelling of 686153985 in words is "six hundred eighty-six million, one hundred fifty-three thousand, nine hundred eighty-five".