133868686831 has 16 divisors (see below), whose sum is σ = 146931321600. Its totient is φ = 120956172480.

The previous prime is 133868686817. The next prime is 133868686841. The reversal of 133868686831 is 138686868331.

It is a de Polignac number, because none of the positive numbers 2^k-133868686831 is a prime.

It is a super-2 number, since 2×133868686831² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 133868686831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133868686811) 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, 2018460 + ... + 2083726.

It is an arithmetic number, because the mean of its divisors is an integer number (9183207600).

Almost surely, 2^133868686831 is an apocalyptic number.

133868686831 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

133868686831 is a deficient number, since it is larger than the sum of its proper divisors (13062634769).

133868686831 is a wasteful number, since it uses less digits than its factorization.

133868686831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66414.

The product of its digits is 23887872, while the sum is 61.

The spelling of 133868686831 in words is "one hundred thirty-three billion, eight hundred sixty-eight million, six hundred eighty-six thousand, eight hundred thirty-one".