66056451011 has 4 divisors (see below), whose sum is σ = 66138103800. Its totient is φ = 65974798224.

The previous prime is 66056450983. The next prime is 66056451103. The reversal of 66056451011 is 11015465066.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11015465066 = 2 ⋅5507732533.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66056451011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66056451511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40825181 + ... + 40826798.

It is an arithmetic number, because the mean of its divisors is an integer number (16534525950).

Almost surely, 2^66056451011 is an apocalyptic number.

66056451011 is a deficient number, since it is larger than the sum of its proper divisors (81652789).

66056451011 is an equidigital number, since it uses as much as digits as its factorization.

66056451011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81652788.

The product of its (nonzero) digits is 21600, while the sum is 35.

The spelling of 66056451011 in words is "sixty-six billion, fifty-six million, four hundred fifty-one thousand, eleven".