66536506 has 4 divisors (see below), whose sum is σ = 99804762. Its totient is φ = 33268252.

The previous prime is 66536479. The next prime is 66536551. The reversal of 66536506 is 60563566.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 41486481 + 25050025 = 6441^2 + 5005^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16634125 + ... + 16634128.

Almost surely, 2^66536506 is an apocalyptic number.

66536506 is a deficient number, since it is larger than the sum of its proper divisors (33268256).

66536506 is a wasteful number, since it uses less digits than its factorization.

66536506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33268255.

The product of its (nonzero) digits is 97200, while the sum is 37.

The square root of 66536506 is about 8156.9912345178. The cubic root of 66536506 is about 405.2160732904.

The spelling of 66536506 in words is "sixty-six million, five hundred thirty-six thousand, five hundred six".