133660681 has 48 divisors (see below), whose sum is σ = 186157440. Its totient is φ = 94456320.

The previous prime is 133660661. The next prime is 133660691. The reversal of 133660681 is 186066331.

It is a happy number.

It is not a de Polignac number, because 133660681 - 2¹³ = 133652489 is a prime.

It is a super-2 number, since 2×133660681² = 35730355290767522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (133660601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 265476 + ... + 265978.

It is an arithmetic number, because the mean of its divisors is an integer number (3878280).

Almost surely, 2^133660681 is an apocalyptic number.

133660681 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

133660681 is a deficient number, since it is larger than the sum of its proper divisors (52496759).

133660681 is a wasteful number, since it uses less digits than its factorization.

133660681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 574 (or 567 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 133660681 is about 11561.1712641929. The cubic root of 133660681 is about 511.2906959234.

The spelling of 133660681 in words is "one hundred thirty-three million, six hundred sixty thousand, six hundred eighty-one".