166610121045613 has 16 divisors (see below), whose sum is σ = 199329206409216. Its totient is φ = 136160375289840.

The previous prime is 166610121045607. The next prime is 166610121045631. The reversal of 166610121045613 is 316540121016661.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 166610121045613 - 2¹³ = 166610121037421 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 166610121045613.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166610121045113) 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, 1663688631 + ... + 1663788772.

It is an arithmetic number, because the mean of its divisors is an integer number (12458075400576).

Almost surely, 2^{166610121045613} is an apocalyptic number.

It is an amenable number.

166610121045613 is a deficient number, since it is larger than the sum of its proper divisors (32719085363603).

166610121045613 is a wasteful number, since it uses less digits than its factorization.

166610121045613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3327477744.

The product of its (nonzero) digits is 155520, while the sum is 43.

The spelling of 166610121045613 in words is "one hundred sixty-six trillion, six hundred ten billion, one hundred twenty-one million, forty-five thousand, six hundred thirteen".