66055511061611 has 4 divisors (see below), whose sum is σ = 66128019856224. Its totient is φ = 65983002267000.

The previous prime is 66055511061583. The next prime is 66055511061637. The reversal of 66055511061611 is 11616011555066.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66055511061611 is a prime.

It is a super-2 number, since 2×66055511061611² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66055511061311) 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, 36254395940 + ... + 36254397761.

It is an arithmetic number, because the mean of its divisors is an integer number (16532004964056).

Almost surely, 2^{66055511061611} is an apocalyptic number.

66055511061611 is a deficient number, since it is larger than the sum of its proper divisors (72508794613).

66055511061611 is an equidigital number, since it uses as much as digits as its factorization.

66055511061611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72508794612.

The product of its (nonzero) digits is 162000, while the sum is 44.

The spelling of 66055511061611 in words is "sixty-six trillion, fifty-five billion, five hundred eleven million, sixty-one thousand, six hundred eleven".