66265616620 has 24 divisors (see below), whose sum is σ = 159037480224. Its totient is φ = 22719639936.

The previous prime is 66265616581. The next prime is 66265616653. The reversal of 66265616620 is 2661656266.

It is a super-2 number, since 2×66265616620² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 236662777 + ... + 236663056.

It is an arithmetic number, because the mean of its divisors is an integer number (6626561676).

Almost surely, 2^66265616620 is an apocalyptic number.

It is an amenable number.

66265616620 is an abundant number, since it is smaller than the sum of its proper divisors (92771863604).

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

66265616620 is a wasteful number, since it uses less digits than its factorization.

66265616620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 473325849 (or 473325847 counting only the distinct ones).

The product of its (nonzero) digits is 933120, while the sum is 46.

The spelling of 66265616620 in words is "sixty-six billion, two hundred sixty-five million, six hundred sixteen thousand, six hundred twenty".