66220751611 has 8 divisors (see below), whose sum is σ = 75695092704. Its totient is φ = 56749968960.

The previous prime is 66220751557. The next prime is 66220751633. The reversal of 66220751611 is 11615702266.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66220751611 - 2⁷ = 66220751483 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66220751411) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 849610 + ... + 924271.

It is an arithmetic number, because the mean of its divisors is an integer number (9461886588).

Almost surely, 2^66220751611 is an apocalyptic number.

66220751611 is a deficient number, since it is larger than the sum of its proper divisors (9474341093).

66220751611 is a wasteful number, since it uses less digits than its factorization.

66220751611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1779221.

The product of its (nonzero) digits is 30240, while the sum is 37.

The spelling of 66220751611 in words is "sixty-six billion, two hundred twenty million, seven hundred fifty-one thousand, six hundred eleven".