166501344536601 has 4 divisors (see below), whose sum is σ = 222001792715472. Its totient is φ = 111000896357732.

The previous prime is 166501344536567. The next prime is 166501344536621. The reversal of 166501344536601 is 106635443105661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 166501344536601 - 2⁶ = 166501344536537 is a prime.

It is not an unprimeable number, because it can be changed into a prime (166501344536621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27750224089431 + ... + 27750224089436.

It is an arithmetic number, because the mean of its divisors is an integer number (55500448178868).

Almost surely, 2^{166501344536601} is an apocalyptic number.

It is an amenable number.

166501344536601 is a deficient number, since it is larger than the sum of its proper divisors (55500448178871).

166501344536601 is an equidigital number, since it uses as much as digits as its factorization.

166501344536601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55500448178870.

The product of its (nonzero) digits is 4665600, while the sum is 51.

The spelling of 166501344536601 in words is "one hundred sixty-six trillion, five hundred one billion, three hundred forty-four million, five hundred thirty-six thousand, six hundred one".