66285752661 has 24 divisors (see below), whose sum is σ = 101155092480. Its totient is φ = 41758881696.

The previous prime is 66285752651. The next prime is 66285752671. The reversal of 66285752661 is 16625758266.

66285752661 is a `hidden beast` number, since 6 + 6 + 2 + 8 + 57 + 526 + 61 = 666.

It is an interprime number because it is at equal distance from previous prime (66285752651) and next prime (66285752671).

It is not a de Polignac number, because 66285752661 - 2⁵ = 66285752629 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66285752598 and 66285752607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66285752641) 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, 2689525 + ... + 2714058.

It is an arithmetic number, because the mean of its divisors is an integer number (4214795520).

Almost surely, 2^66285752661 is an apocalyptic number.

It is an amenable number.

66285752661 is a deficient number, since it is larger than the sum of its proper divisors (34869339819).

66285752661 is a wasteful number, since it uses less digits than its factorization.

66285752661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5403665 (or 5403662 counting only the distinct ones).

The product of its digits is 7257600, while the sum is 54.

The spelling of 66285752661 in words is "sixty-six billion, two hundred eighty-five million, seven hundred fifty-two thousand, six hundred sixty-one".