133457661 has 24 divisors (see below), whose sum is σ = 202550400. Its totient is φ = 84512736.

The previous prime is 133457647. The next prime is 133457671. The reversal of 133457661 is 166754331.

It is not a de Polignac number, because 133457661 - 2⁵ = 133457629 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133457641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 28680 + ... + 33006.

It is an arithmetic number, because the mean of its divisors is an integer number (8439600).

Almost surely, 2^133457661 is an apocalyptic number.

It is an amenable number.

133457661 is a deficient number, since it is larger than the sum of its proper divisors (69092739).

133457661 is a wasteful number, since it uses less digits than its factorization.

133457661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4505 (or 4502 counting only the distinct ones).

The product of its digits is 45360, while the sum is 36.

The square root of 133457661 is about 11552.3876752817. The cubic root of 133457661 is about 511.0316947060.

The spelling of 133457661 in words is "one hundred thirty-three million, four hundred fifty-seven thousand, six hundred sixty-one".