66022776555620 has 24 divisors (see below), whose sum is σ = 138647986157688. Its totient is φ = 26409081024000.

The previous prime is 66022776555613. The next prime is 66022776555643. The reversal of 66022776555620 is 2655567722066.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 5636293831744 + 60386482723876 = 2374088^2 + 7770874^2 .

It is a super-2 number, since 2×66022776555620² (a number of 28 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 66022776555620.

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, 28943180 + ... + 31140860.

It is an arithmetic number, because the mean of its divisors is an integer number (5776999423237).

Almost surely, 2^{66022776555620} is an apocalyptic number.

It is an amenable number.

66022776555620 is an abundant number, since it is smaller than the sum of its proper divisors (72625209602068).

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

66022776555620 is a wasteful number, since it uses less digits than its factorization.

66022776555620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3699791 (or 3699789 counting only the distinct ones).

The product of its (nonzero) digits is 63504000, while the sum is 59.

The spelling of 66022776555620 in words is "sixty-six trillion, twenty-two billion, seven hundred seventy-six million, five hundred fifty-five thousand, six hundred twenty".