166553233664 has 18 divisors (see below), whose sum is σ = 332455869270. Its totient is φ = 83276616704.

The previous prime is 166553233589. The next prime is 166553233723. The reversal of 166553233664 is 466332355661.

It can be written as a sum of positive squares in only one way, i.e., 145167096064 + 21386137600 = 381008^2 + 146240^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 325299029 + ... + 325299540.

It is an arithmetic number, because the mean of its divisors is an integer number (18469770515).

Almost surely, 2^166553233664 is an apocalyptic number.

It is an amenable number.

166553233664 is a deficient number, since it is larger than the sum of its proper divisors (165902635606).

166553233664 is an frugal number, since it uses more digits than its factorization.

166553233664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 650598585 (or 650598571 counting only the distinct ones).

The product of its digits is 6998400, while the sum is 50.

The spelling of 166553233664 in words is "one hundred sixty-six billion, five hundred fifty-three million, two hundred thirty-three thousand, six hundred sixty-four".