66353165640 has 48 divisors (see below), whose sum is σ = 215647789500. Its totient is φ = 17694177408.

The previous prime is 66353165629. The next prime is 66353165729. The reversal of 66353165640 is 4656135366.

66353165640 is a `hidden beast` number, since 6 + 63 + 531 + 6 + 56 + 4 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 65028060036 + 1325105604 = 255006^2 + 36402^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 92156815 + ... + 92157534.

Almost surely, 2^66353165640 is an apocalyptic number.

66353165640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66353165640 is an abundant number, since it is smaller than the sum of its proper divisors (149294623860).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66353165640 is a wasteful number, since it uses less digits than its factorization.

66353165640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 184314366 (or 184314359 counting only the distinct ones).

The product of its (nonzero) digits is 1166400, while the sum is 45.

The spelling of 66353165640 in words is "sixty-six billion, three hundred fifty-three million, one hundred sixty-five thousand, six hundred forty".