66523163 has 4 divisors (see below), whose sum is σ = 76026480. Its totient is φ = 57019848.

The previous prime is 66523141. The next prime is 66523169. The reversal of 66523163 is 36132566.

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 66523163 - 2⁶ = 66523099 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66523169) 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, 4751648 + ... + 4751661.

It is an arithmetic number, because the mean of its divisors is an integer number (19006620).

Almost surely, 2^66523163 is an apocalyptic number.

66523163 is a deficient number, since it is larger than the sum of its proper divisors (9503317).

66523163 is an equidigital number, since it uses as much as digits as its factorization.

66523163 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9503316.

The product of its digits is 19440, while the sum is 32.

The square root of 66523163 is about 8156.1733061528. The cubic root of 66523163 is about 405.1889846046.

The spelling of 66523163 in words is "sixty-six million, five hundred twenty-three thousand, one hundred sixty-three".