66266051 has 4 divisors (see below), whose sum is σ = 70164072. Its totient is φ = 62368032.

The previous prime is 66266047. The next prime is 66266071. The reversal of 66266051 is 15066266.

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 66266051 - 2² = 66266047 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66265999 and 66266017.

It is not an unprimeable number, because it can be changed into a prime (66266021) 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, 1948985 + ... + 1949018.

It is an arithmetic number, because the mean of its divisors is an integer number (17541018).

Almost surely, 2^66266051 is an apocalyptic number.

66266051 is a deficient number, since it is larger than the sum of its proper divisors (3898021).

66266051 is a wasteful number, since it uses less digits than its factorization.

66266051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3898020.

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 66266051 is about 8140.3962434270. The cubic root of 66266051 is about 404.6662921987. Note that the first 3 decimals are identical.

The spelling of 66266051 in words is "sixty-six million, two hundred sixty-six thousand, fifty-one".