66091533 has 4 divisors (see below), whose sum is σ = 88122048. Its totient is φ = 44061020.

The previous prime is 66091523. The next prime is 66091561. The reversal of 66091533 is 33519066.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 66091533 - 2⁴ = 66091517 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66091494 and 66091503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66091513) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11015253 + ... + 11015258.

It is an arithmetic number, because the mean of its divisors is an integer number (22030512).

Almost surely, 2^66091533 is an apocalyptic number.

It is an amenable number.

66091533 is a deficient number, since it is larger than the sum of its proper divisors (22030515).

66091533 is a wasteful number, since it uses less digits than its factorization.

66091533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22030514.

The product of its (nonzero) digits is 14580, while the sum is 33.

The square root of 66091533 is about 8129.6699194986. The cubic root of 66091533 is about 404.3107373910.

The spelling of 66091533 in words is "sixty-six million, ninety-one thousand, five hundred thirty-three".