66368506 has 4 divisors (see below), whose sum is σ = 99552762. Its totient is φ = 33184252.

The previous prime is 66368503. The next prime is 66368513. The reversal of 66368506 is 60586366.

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., 62267881 + 4100625 = 7891^2 + 2025^2 .

It is not an unprimeable number, because it can be changed into a prime (66368503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16592125 + ... + 16592128.

Almost surely, 2^66368506 is an apocalyptic number.

66368506 is a deficient number, since it is larger than the sum of its proper divisors (33184256).

66368506 is a wasteful number, since it uses less digits than its factorization.

66368506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33184255.

The product of its (nonzero) digits is 155520, while the sum is 40.

The square root of 66368506 is about 8146.6868112135. The cubic root of 66368506 is about 404.8747384811.

It can be divided in two parts, 663 and 68506, that added together give a square (69169 = 263²).

The spelling of 66368506 in words is "sixty-six million, three hundred sixty-eight thousand, five hundred six".