66552521081380 has 48 divisors (see below), whose sum is σ = 140407710206400. Its totient is φ = 26497828080000.

The previous prime is 66552521081317. The next prime is 66552521081381. The reversal of 66552521081380 is 8318012525566.

It is not an unprimeable number, because it can be changed into a prime (66552521081381) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3496615 + ... + 12055345.

It is an arithmetic number, because the mean of its divisors is an integer number (2925160629300).

Almost surely, 2^{66552521081380} is an apocalyptic number.

It is an amenable number.

66552521081380 is an abundant number, since it is smaller than the sum of its proper divisors (73855189125020).

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

66552521081380 is a wasteful number, since it uses less digits than its factorization.

66552521081380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8560540 (or 8560538 counting only the distinct ones).

The product of its (nonzero) digits is 3456000, while the sum is 52.

The spelling of 66552521081380 in words is "sixty-six trillion, five hundred fifty-two billion, five hundred twenty-one million, eighty-one thousand, three hundred eighty".