133663257 has 32 divisors (see below), whose sum is σ = 243720960. Its totient is φ = 70502400.

The previous prime is 133663241. The next prime is 133663331. The reversal of 133663257 is 752366331.

133663257 is a `hidden beast` number, since 13 + 3 + 6 + 632 + 5 + 7 = 666.

It is not a de Polignac number, because 133663257 - 2⁴ = 133663241 is a prime.

It is not an unprimeable number, because it can be changed into a prime (133663357) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 24744 + ... + 29657.

It is an arithmetic number, because the mean of its divisors is an integer number (7616280).

Almost surely, 2^133663257 is an apocalyptic number.

It is an amenable number.

133663257 is a deficient number, since it is larger than the sum of its proper divisors (110057703).

133663257 is a wasteful number, since it uses less digits than its factorization.

133663257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54430 (or 54424 counting only the distinct ones).

The product of its digits is 68040, while the sum is 36.

The square root of 133663257 is about 11561.2826710534. The cubic root of 133663257 is about 511.2939805502.

The spelling of 133663257 in words is "one hundred thirty-three million, six hundred sixty-three thousand, two hundred fifty-seven".