66163507 has 4 divisors (see below), whose sum is σ = 70055496. Its totient is φ = 62271520.

The previous prime is 66163501. The next prime is 66163549. The reversal of 66163507 is 70536166.

It is a happy number.

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 66163507 - 2³ = 66163499 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66163501) 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, 1945969 + ... + 1946002.

It is an arithmetic number, because the mean of its divisors is an integer number (17513874).

Almost surely, 2^66163507 is an apocalyptic number.

66163507 is a deficient number, since it is larger than the sum of its proper divisors (3891989).

66163507 is a wasteful number, since it uses less digits than its factorization.

66163507 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3891988.

The product of its (nonzero) digits is 22680, while the sum is 34.

The square root of 66163507 is about 8134.0953399871. The cubic root of 66163507 is about 404.4574495985.

The spelling of 66163507 in words is "sixty-six million, one hundred sixty-three thousand, five hundred seven".