66166161101 has 4 divisors (see below), whose sum is σ = 66166698912. Its totient is φ = 66165623292.

The previous prime is 66166161073. The next prime is 66166161121. The reversal of 66166161101 is 10116166166.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 66166161101 - 2²² = 66161966797 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66166161121) 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, 16880 + ... + 364166.

It is an arithmetic number, because the mean of its divisors is an integer number (16541674728).

Almost surely, 2^66166161101 is an apocalyptic number.

It is an amenable number.

66166161101 is a deficient number, since it is larger than the sum of its proper divisors (537811).

66166161101 is a wasteful number, since it uses less digits than its factorization.

66166161101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 537810.

The product of its (nonzero) digits is 7776, while the sum is 35.

The spelling of 66166161101 in words is "sixty-six billion, one hundred sixty-six million, one hundred sixty-one thousand, one hundred one".