133661265 has 32 divisors (see below), whose sum is σ = 217147392. Its totient is φ = 70200000.

The previous prime is 133661249. The next prime is 133661273. The reversal of 133661265 is 562166331.

It is not a de Polignac number, because 133661265 - 2⁴ = 133661249 is a prime.

It is a super-2 number, since 2×133661265² = 35730667522800450, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 493080 + ... + 493350.

It is an arithmetic number, because the mean of its divisors is an integer number (6785856).

Almost surely, 2^133661265 is an apocalyptic number.

133661265 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

133661265 is a deficient number, since it is larger than the sum of its proper divisors (83486127).

133661265 is a wasteful number, since it uses less digits than its factorization.

133661265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 661.

The product of its digits is 19440, while the sum is 33.

The square root of 133661265 is about 11561.1965211219. The cubic root of 133661265 is about 511.2914405785.

The spelling of 133661265 in words is "one hundred thirty-three million, six hundred sixty-one thousand, two hundred sixty-five".