66180939952 has 20 divisors (see below), whose sum is σ = 128238042240. Its totient is φ = 33087251648.

The previous prime is 66180939917. The next prime is 66180939989. The reversal of 66180939952 is 25993908166.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26923 + ... + 364810.

It is an arithmetic number, because the mean of its divisors is an integer number (6411902112).

Almost surely, 2^66180939952 is an apocalyptic number.

It is an amenable number.

66180939952 is a deficient number, since it is larger than the sum of its proper divisors (62057102288).

66180939952 is a wasteful number, since it uses less digits than its factorization.

66180939952 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 402300 (or 402294 counting only the distinct ones).

The product of its (nonzero) digits is 6298560, while the sum is 58.

The spelling of 66180939952 in words is "sixty-six billion, one hundred eighty million, nine hundred thirty-nine thousand, nine hundred fifty-two".