166046564650521 has 8 divisors (see below), whose sum is σ = 222519254151744. Its totient is φ = 110135792458160.

The previous prime is 166046564650511. The next prime is 166046564650529. The reversal of 166046564650521 is 125056465640661.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 166046564650521 - 2⁶ = 166046564650457 is a prime.

It is not an unprimeable number, because it can be changed into a prime (166046564650529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 140479326525 + ... + 140479327706.

It is an arithmetic number, because the mean of its divisors is an integer number (27814906768968).

Almost surely, 2^{166046564650521} is an apocalyptic number.

It is an amenable number.

166046564650521 is a deficient number, since it is larger than the sum of its proper divisors (56472689501223).

166046564650521 is a wasteful number, since it uses less digits than its factorization.

166046564650521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280958654431.

The product of its (nonzero) digits is 31104000, while the sum is 57.

The spelling of 166046564650521 in words is "one hundred sixty-six trillion, forty-six billion, five hundred sixty-four million, six hundred fifty thousand, five hundred twenty-one".