166651315441 has 16 divisors (see below), whose sum is σ = 191628936576. Its totient is φ = 143721680256.

The previous prime is 166651315433. The next prime is 166651315447. The reversal of 166651315441 is 144513156661.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 166651315441 - 2³ = 166651315433 is a prime.

It is a super-3 number, since 3×166651315441³ (a number of 35 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166651315447) 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, 6468100 + ... + 6493813.

It is an arithmetic number, because the mean of its divisors is an integer number (11976808536).

Almost surely, 2^166651315441 is an apocalyptic number.

It is an amenable number.

166651315441 is a deficient number, since it is larger than the sum of its proper divisors (24977621135).

166651315441 is a wasteful number, since it uses less digits than its factorization.

166651315441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12961992.

The product of its digits is 259200, while the sum is 43.

The spelling of 166651315441 in words is "one hundred sixty-six billion, six hundred fifty-one million, three hundred fifteen thousand, four hundred forty-one".