66525531 has 4 divisors (see below), whose sum is σ = 88700712. Its totient is φ = 44350352.

The previous prime is 66525523. The next prime is 66525541. The reversal of 66525531 is 13552566.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66525531 - 2³ = 66525523 is a prime.

It is a super-2 number, since 2×66525531² = 8851292549663922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 66525492 and 66525501.

It is not an unprimeable number, because it can be changed into a prime (66525541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11087586 + ... + 11087591.

It is an arithmetic number, because the mean of its divisors is an integer number (22175178).

Almost surely, 2^66525531 is an apocalyptic number.

66525531 is a deficient number, since it is larger than the sum of its proper divisors (22175181).

66525531 is a wasteful number, since it uses less digits than its factorization.

66525531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22175180.

The product of its digits is 27000, while the sum is 33.

The square root of 66525531 is about 8156.3184709770. The cubic root of 66525531 is about 405.1937923342.

The spelling of 66525531 in words is "sixty-six million, five hundred twenty-five thousand, five hundred thirty-one".