686841182551 has 16 divisors (see below), whose sum is σ = 746804713248. Its totient is φ = 629158118400.

The previous prime is 686841182519. The next prime is 686841182567. The reversal of 686841182551 is 155281148686.

It is a cyclic number.

It is not a de Polignac number, because 686841182551 - 2⁵ = 686841182519 is a prime.

It is a super-2 number, since 2×686841182551² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 686841182492 and 686841182501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686841182351) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1466460 + ... + 1877281.

It is an arithmetic number, because the mean of its divisors is an integer number (46675294578).

Almost surely, 2^686841182551 is an apocalyptic number.

686841182551 is a deficient number, since it is larger than the sum of its proper divisors (59963530697).

686841182551 is a wasteful number, since it uses less digits than its factorization.

686841182551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3344082.

The product of its digits is 3686400, while the sum is 55.

The spelling of 686841182551 in words is "six hundred eighty-six billion, eight hundred forty-one million, one hundred eighty-two thousand, five hundred fifty-one".