66552622918997 has 4 divisors (see below), whose sum is σ = 66558953436780. Its totient is φ = 66546292401216.

The previous prime is 66552622918979. The next prime is 66552622919011. The reversal of 66552622918997 is 79981922625566.

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

It can be written as a sum of positive squares in 2 ways, for example, as 8996214398161 + 57556408520836 = 2999369^2 + 7586594^2 .

It is a cyclic number.

It is not a de Polignac number, because 66552622918997 - 2⁸ = 66552622918741 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66552622618997) 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, 3165243122 + ... + 3165264147.

It is an arithmetic number, because the mean of its divisors is an integer number (16639738359195).

Almost surely, 2^{66552622918997} is an apocalyptic number.

It is an amenable number.

66552622918997 is a deficient number, since it is larger than the sum of its proper divisors (6330517783).

66552622918997 is a wasteful number, since it uses less digits than its factorization.

66552622918997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6330517782.

The product of its digits is 1763596800, while the sum is 77.

The spelling of 66552622918997 in words is "sixty-six trillion, five hundred fifty-two billion, six hundred twenty-two million, nine hundred eighteen thousand, nine hundred ninety-seven".