166600651661 has 8 divisors (see below), whose sum is σ = 178526001024. Its totient is φ = 154911448000.

The previous prime is 166600651649. The next prime is 166600651667. The reversal of 166600651661 is 166156006661.

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 166600651661 - 2¹⁸ = 166600389517 is a prime.

It is a super-3 number, since 3×166600651661³ (a number of 35 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166600651667) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59034965 + ... + 59037786.

It is an arithmetic number, because the mean of its divisors is an integer number (22315750128).

Almost surely, 2^166600651661 is an apocalyptic number.

It is an amenable number.

166600651661 is a deficient number, since it is larger than the sum of its proper divisors (11925349363).

166600651661 is a wasteful number, since it uses less digits than its factorization.

166600651661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118072851.

The product of its (nonzero) digits is 233280, while the sum is 44.

The spelling of 166600651661 in words is "one hundred sixty-six billion, six hundred million, six hundred fifty-one thousand, six hundred sixty-one".