66655518338601 has 24 divisors (see below), whose sum is σ = 96608060412864. Its totient is φ = 44285731590240.

The previous prime is 66655518338587. The next prime is 66655518338671. The reversal of 66655518338601 is 10683381555666.

It is a happy number.

It is not a de Polignac number, because 66655518338601 - 2¹⁹ = 66655517814313 is a prime.

It is a super-3 number, since 3×66655518338601³ (a number of 42 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (66655518338671) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16987335 + ... + 20539731.

It is an arithmetic number, because the mean of its divisors is an integer number (4025335850536).

Almost surely, 2^{66655518338601} is an apocalyptic number.

It is an amenable number.

66655518338601 is a deficient number, since it is larger than the sum of its proper divisors (29952542074263).

66655518338601 is a wasteful number, since it uses less digits than its factorization.

66655518338601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3559501 (or 3559498 counting only the distinct ones).

The product of its (nonzero) digits is 93312000, while the sum is 63.

The spelling of 66655518338601 in words is "sixty-six trillion, six hundred fifty-five billion, five hundred eighteen million, three hundred thirty-eight thousand, six hundred one".