66052211616601 has 4 divisors (see below), whose sum is σ = 75488241847552. Its totient is φ = 56616181385652.

The previous prime is 66052211616569. The next prime is 66052211616659. The reversal of 66052211616601 is 10661611225066.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 66052211616601 - 2⁵ = 66052211616569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66052211616101) 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, 4718015115465 + ... + 4718015115478.

It is an arithmetic number, because the mean of its divisors is an integer number (18872060461888).

Almost surely, 2^{66052211616601} is an apocalyptic number.

It is an amenable number.

66052211616601 is a deficient number, since it is larger than the sum of its proper divisors (9436030230951).

66052211616601 is an equidigital number, since it uses as much as digits as its factorization.

66052211616601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9436030230950.

The product of its (nonzero) digits is 155520, while the sum is 43.

The spelling of 66052211616601 in words is "sixty-six trillion, fifty-two billion, two hundred eleven million, six hundred sixteen thousand, six hundred one".