166640043504253 has 16 divisors (see below), whose sum is σ = 194493987570240. Its totient is φ = 141164990956800.

The previous prime is 166640043504169. The next prime is 166640043504293. The reversal of 166640043504253 is 352405340046661.

It is a cyclic number.

It is not a de Polignac number, because 166640043504253 - 2²¹ = 166640041407101 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 166640043504197 and 166640043504206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166640043504293) 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, 6535403500 + ... + 6535428997.

It is an arithmetic number, because the mean of its divisors is an integer number (12155874223140).

Almost surely, 2^{166640043504253} is an apocalyptic number.

It is an amenable number.

166640043504253 is a deficient number, since it is larger than the sum of its proper divisors (27853944065987).

166640043504253 is a wasteful number, since it uses less digits than its factorization.

166640043504253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13070832588.

The product of its (nonzero) digits is 6220800, while the sum is 49.

The spelling of 166640043504253 in words is "one hundred sixty-six trillion, six hundred forty billion, forty-three million, five hundred four thousand, two hundred fifty-three".