166561533245516 has 6 divisors (see below), whose sum is σ = 291482683179660. Its totient is φ = 83280766622756.

The previous prime is 166561533245507. The next prime is 166561533245519. The reversal of 166561533245516 is 615542335165661.

166561533245516 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (166561533245519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20820191655686 + ... + 20820191655693.

It is an arithmetic number, because the mean of its divisors is an integer number (48580447196610).

Almost surely, 2^{166561533245516} is an apocalyptic number.

It is an amenable number.

166561533245516 is a deficient number, since it is larger than the sum of its proper divisors (124921149934144).

166561533245516 is a wasteful number, since it uses less digits than its factorization.

166561533245516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41640383311383 (or 41640383311381 counting only the distinct ones).

The product of its digits is 58320000, while the sum is 59.

The spelling of 166561533245516 in words is "one hundred sixty-six trillion, five hundred sixty-one billion, five hundred thirty-three million, two hundred forty-five thousand, five hundred sixteen".