66158780805800 has 24 divisors (see below), whose sum is σ = 153819165373950. Its totient is φ = 26463512322240.

The previous prime is 66158780805763. The next prime is 66158780805907. The reversal of 66158780805800 is 850808785166.

It can be written as a sum of positive squares in 3 ways, for example, as 61778876882116 + 4379903923684 = 7859954^2 + 2092822^2 .

It is a super-3 number, since 3×66158780805800³ (a number of 42 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 165396951815 + ... + 165396952214.

Almost surely, 2^{66158780805800} is an apocalyptic number.

It is an amenable number.

66158780805800 is an abundant number, since it is smaller than the sum of its proper divisors (87660384568150).

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

66158780805800 is a wasteful number, since it uses less digits than its factorization.

66158780805800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330793904045 (or 330793904036 counting only the distinct ones).

The product of its (nonzero) digits is 25804800, while the sum is 62.

The spelling of 66158780805800 in words is "sixty-six trillion, one hundred fifty-eight billion, seven hundred eighty million, eight hundred five thousand, eight hundred".