66017657601 has 12 divisors (see below), whose sum is σ = 108981530112. Its totient is φ = 37724375736.

The previous prime is 66017657599. The next prime is 66017657623. The reversal of 66017657601 is 10675671066.

66017657601 is a `hidden beast` number, since 6 + 6 + 0 + 1 + 76 + 576 + 0 + 1 = 666.

It is not a de Polignac number, because 66017657601 - 2¹ = 66017657599 is a prime.

It is a super-2 number, since 2×66017657601² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66017657401) 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 11 ways as a sum of consecutive naturals, for example, 523949601 + ... + 523949726.

It is an arithmetic number, because the mean of its divisors is an integer number (9081794176).

Almost surely, 2^66017657601 is an apocalyptic number.

It is an amenable number.

66017657601 is a deficient number, since it is larger than the sum of its proper divisors (42963872511).

66017657601 is a wasteful number, since it uses less digits than its factorization.

66017657601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1047899340 (or 1047899337 counting only the distinct ones).

The product of its (nonzero) digits is 317520, while the sum is 45.

The spelling of 66017657601 in words is "sixty-six billion, seventeen million, six hundred fifty-seven thousand, six hundred one".