66505533 has 4 divisors (see below), whose sum is σ = 88674048. Its totient is φ = 44337020.

The previous prime is 66505531. The next prime is 66505559. The reversal of 66505533 is 33550566.

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 66505533 - 2¹ = 66505531 is a prime.

It is a super-2 number, since 2×66505533² = 8845971839228178, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 66505494 and 66505503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66505531) 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, 11084253 + ... + 11084258.

It is an arithmetic number, because the mean of its divisors is an integer number (22168512).

Almost surely, 2^66505533 is an apocalyptic number.

It is an amenable number.

66505533 is a deficient number, since it is larger than the sum of its proper divisors (22168515).

66505533 is a wasteful number, since it uses less digits than its factorization.

66505533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22168514.

The product of its (nonzero) digits is 40500, while the sum is 33.

The square root of 66505533 is about 8155.0924580902. The cubic root of 66505533 is about 405.1531869835.

The spelling of 66505533 in words is "sixty-six million, five hundred five thousand, five hundred thirty-three".