166564106116651 has 16 divisors (see below), whose sum is σ = 167453000144640. Its totient is φ = 165677139628000.

The previous prime is 166564106116633. The next prime is 166564106116679. The reversal of 166564106116651 is 156611601465661.

It is a cyclic number.

It is not a de Polignac number, because 166564106116651 - 2¹³ = 166564106108459 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 166564106116592 and 166564106116601.

It is not an unprimeable number, because it can be changed into a prime (166564106116621) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 603830106 + ... + 604105888.

It is an arithmetic number, because the mean of its divisors is an integer number (10465812509040).

Almost surely, 2^{166564106116651} is an apocalyptic number.

166564106116651 is a deficient number, since it is larger than the sum of its proper divisors (888894027989).

166564106116651 is a wasteful number, since it uses less digits than its factorization.

166564106116651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 279266.

The product of its (nonzero) digits is 4665600, while the sum is 55.

The spelling of 166564106116651 in words is "one hundred sixty-six trillion, five hundred sixty-four billion, one hundred six million, one hundred sixteen thousand, six hundred fifty-one".