166564643452 has 12 divisors (see below), whose sum is σ = 291491600400. Its totient is φ = 83281329056.

The previous prime is 166564643431. The next prime is 166564643461. The reversal of 166564643452 is 254346465661.

It is a self number, because there is not a number n which added to its sum of digits gives 166564643452.

It is a congruent number.

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, 233049 + ... + 622447.

It is an arithmetic number, because the mean of its divisors is an integer number (24290966700).

Almost surely, 2^166564643452 is an apocalyptic number.

It is an amenable number.

166564643452 is a deficient number, since it is larger than the sum of its proper divisors (124926956948).

166564643452 is a wasteful number, since it uses less digits than its factorization.

166564643452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 496340 (or 496338 counting only the distinct ones).

The product of its digits is 12441600, while the sum is 52.

The spelling of 166564643452 in words is "one hundred sixty-six billion, five hundred sixty-four million, six hundred forty-three thousand, four hundred fifty-two".