66120263 has 4 divisors (see below), whose sum is σ = 72131208. Its totient is φ = 60109320.

The previous prime is 66120253. The next prime is 66120269. The reversal of 66120263 is 36202166.

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 66120263 - 2⁶ = 66120199 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66120269) 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, 3005456 + ... + 3005477.

It is an arithmetic number, because the mean of its divisors is an integer number (18032802).

Almost surely, 2^66120263 is an apocalyptic number.

66120263 is a deficient number, since it is larger than the sum of its proper divisors (6010945).

66120263 is a wasteful number, since it uses less digits than its factorization.

66120263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6010944.

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 66120263 is about 8131.4367119224. The cubic root of 66120263 is about 404.3693135516.

The spelling of 66120263 in words is "sixty-six million, one hundred twenty thousand, two hundred sixty-three".