66055798956 has 24 divisors (see below), whose sum is σ = 176148797440. Its totient is φ = 18873085392.

The previous prime is 66055798933. The next prime is 66055798987. The reversal of 66055798956 is 65989755066.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 393189196 + ... + 393189363.

Almost surely, 2^66055798956 is an apocalyptic number.

It is an amenable number.

66055798956 is an abundant number, since it is smaller than the sum of its proper divisors (110092998484).

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

66055798956 is a wasteful number, since it uses less digits than its factorization.

66055798956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 786378573 (or 786378571 counting only the distinct ones).

The product of its (nonzero) digits is 122472000, while the sum is 66.

The spelling of 66055798956 in words is "sixty-six billion, fifty-five million, seven hundred ninety-eight thousand, nine hundred fifty-six".