133761661 has 8 divisors (see below), whose sum is σ = 154505664. Its totient is φ = 114448320.

The previous prime is 133761643. The next prime is 133761679. The reversal of 133761661 is 166167331.

It is an interprime number because it is at equal distance from previous prime (133761643) and next prime (133761679).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 133761661 - 2⁷ = 133761533 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133761161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 357465 + ... + 357838.

It is an arithmetic number, because the mean of its divisors is an integer number (19313208).

Almost surely, 2^133761661 is an apocalyptic number.

133761661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

133761661 is a deficient number, since it is larger than the sum of its proper divisors (20744003).

133761661 is a wasteful number, since it uses less digits than its factorization.

133761661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 715331.

The product of its digits is 13608, while the sum is 34.

The square root of 133761661 is about 11565.5376442256. The cubic root of 133761661 is about 511.4194227298.

The spelling of 133761661 in words is "one hundred thirty-three million, seven hundred sixty-one thousand, six hundred sixty-one".