66222220051 has 4 divisors (see below), whose sum is σ = 71316236992. Its totient is φ = 61128203112.

The previous prime is 66222220049. The next prime is 66222220063. The reversal of 66222220051 is 15002222266.

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 66222220051 - 2¹ = 66222220049 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66222220451) 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, 2547008451 + ... + 2547008476.

It is an arithmetic number, because the mean of its divisors is an integer number (17829059248).

Almost surely, 2^66222220051 is an apocalyptic number.

66222220051 is a deficient number, since it is larger than the sum of its proper divisors (5094016941).

66222220051 is a wasteful number, since it uses less digits than its factorization.

66222220051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5094016940.

The product of its (nonzero) digits is 5760, while the sum is 28.

The spelling of 66222220051 in words is "sixty-six billion, two hundred twenty-two million, two hundred twenty thousand, fifty-one".