66626114857 has 8 divisors (see below), whose sum is σ = 66955895240. Its totient is φ = 66296672640.

The previous prime is 66626114809. The next prime is 66626114881. The reversal of 66626114857 is 75841162666.

It can be written as a sum of positive squares in 4 ways, for example, as 2424183696 + 64201931161 = 49236^2 + 253381^2 .

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 66626114857 - 2¹¹ = 66626112809 is a prime.

It is a super-2 number, since 2×66626114857² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66626114657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 315133 + ... + 482245.

It is an arithmetic number, because the mean of its divisors is an integer number (8369486905).

Almost surely, 2^66626114857 is an apocalyptic number.

It is an amenable number.

66626114857 is a deficient number, since it is larger than the sum of its proper divisors (329780383).

66626114857 is a wasteful number, since it uses less digits than its factorization.

66626114857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169083.

The product of its digits is 2903040, while the sum is 52.

The spelling of 66626114857 in words is "sixty-six billion, six hundred twenty-six million, one hundred fourteen thousand, eight hundred fifty-seven".