66516227620 has 24 divisors (see below), whose sum is σ = 139801806144. Its totient is φ = 26584066656.

The previous prime is 66516227567. The next prime is 66516227627. The reversal of 66516227620 is 2672261566.

It is not an unprimeable number, because it can be changed into a prime (66516227627) 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, 1377192 + ... + 1424671.

It is an arithmetic number, because the mean of its divisors is an integer number (5825075256).

Almost surely, 2^66516227620 is an apocalyptic number.

It is an amenable number.

66516227620 is an abundant number, since it is smaller than the sum of its proper divisors (73285578524).

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

66516227620 is a wasteful number, since it uses less digits than its factorization.

66516227620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2803059 (or 2803057 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 43.

The spelling of 66516227620 in words is "sixty-six billion, five hundred sixteen million, two hundred twenty-seven thousand, six hundred twenty".