66487475540 has 12 divisors (see below), whose sum is σ = 139623698676. Its totient is φ = 26594990208.

The previous prime is 66487475521. The next prime is 66487475581. The reversal of 66487475540 is 4557478466.

It can be written as a sum of positive squares in 2 ways, for example, as 22741243204 + 43746232336 = 150802^2 + 209156^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1662186869 + ... + 1662186908.

It is an arithmetic number, because the mean of its divisors is an integer number (11635308223).

Almost surely, 2^66487475540 is an apocalyptic number.

It is an amenable number.

66487475540 is an abundant number, since it is smaller than the sum of its proper divisors (73136223136).

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

66487475540 is a wasteful number, since it uses less digits than its factorization.

66487475540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3324373786 (or 3324373784 counting only the distinct ones).

The product of its (nonzero) digits is 22579200, while the sum is 56.

The spelling of 66487475540 in words is "sixty-six billion, four hundred eighty-seven million, four hundred seventy-five thousand, five hundred forty".