133687671885 has 20 divisors (see below), whose sum is σ = 239647531068. Its totient is φ = 71300091456.

The previous prime is 133687671863. The next prime is 133687671889. The reversal of 133687671885 is 588176786331.

It can be written as a sum of positive squares in 2 ways, for example, as 26165327049 + 107522344836 = 161757^2 + 327906^2 .

It is not a de Polignac number, because 133687671885 - 2¹¹ = 133687669837 is a prime.

It is a super-2 number, since 2×133687671885² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133687671889) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 165046104 + ... + 165046913.

Almost surely, 2^133687671885 is an apocalyptic number.

133687671885 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

133687671885 is a deficient number, since it is larger than the sum of its proper divisors (105959859183).

133687671885 is an equidigital number, since it uses as much as digits as its factorization.

133687671885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330093034 (or 330093025 counting only the distinct ones).

The product of its digits is 40642560, while the sum is 63.

The spelling of 133687671885 in words is "one hundred thirty-three billion, six hundred eighty-seven million, six hundred seventy-one thousand, eight hundred eighty-five".