66153564810 has 32 divisors (see below), whose sum is σ = 176409506880. Its totient is φ = 17640950544.

The previous prime is 66153564793. The next prime is 66153564817. The reversal of 66153564810 is 1846535166.

66153564810 is a `hidden beast` number, since 6 + 6 + 1 + 5 + 3 + 564 + 81 + 0 = 666.

It is a super-2 number, since 2×66153564810² (a number of 22 digits) contains 22 as substring.

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

It is not an unprimeable number, because it can be changed into a prime (66153564817) 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 15 ways as a sum of consecutive naturals, for example, 122506332 + ... + 122506871.

It is an arithmetic number, because the mean of its divisors is an integer number (5512797090).

Almost surely, 2^66153564810 is an apocalyptic number.

66153564810 is an abundant number, since it is smaller than the sum of its proper divisors (110255942070).

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

66153564810 is a wasteful number, since it uses less digits than its factorization.

66153564810 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245013219 (or 245013213 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 45.

The spelling of 66153564810 in words is "sixty-six billion, one hundred fifty-three million, five hundred sixty-four thousand, eight hundred ten".