66161868820324 has 48 divisors (see below), whose sum is σ = 121495319487360. Its totient is φ = 31465203517440.

The previous prime is 66161868820213. The next prime is 66161868820367. The reversal of 66161868820324 is 42302886816166.

It is a super-2 number, since 2×66161868820324² (a number of 28 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40734754 + ... + 42327814.

It is an arithmetic number, because the mean of its divisors is an integer number (2531152489320).

Almost surely, 2^{66161868820324} is an apocalyptic number.

It is an amenable number.

66161868820324 is a deficient number, since it is larger than the sum of its proper divisors (55333450667036).

66161868820324 is a wasteful number, since it uses less digits than its factorization.

66161868820324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1595620 (or 1595618 counting only the distinct ones).

The product of its (nonzero) digits is 31850496, while the sum is 61.

The spelling of 66161868820324 in words is "sixty-six trillion, one hundred sixty-one billion, eight hundred sixty-eight million, eight hundred twenty thousand, three hundred twenty-four".