191601666101 has 8 divisors (see below), whose sum is σ = 193835073600. Its totient is φ = 189370049440.

The previous prime is 191601666043. The next prime is 191601666107. The reversal of 191601666101 is 101666106191.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-191601666101 is a prime.

It is a super-2 number, since 2×191601666101² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191601666107) 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, 231881 + ... + 661038.

It is an arithmetic number, because the mean of its divisors is an integer number (24229384200).

Almost surely, 2^191601666101 is an apocalyptic number.

It is an amenable number.

191601666101 is a deficient number, since it is larger than the sum of its proper divisors (2233407499).

191601666101 is an equidigital number, since it uses as much as digits as its factorization.

191601666101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 895419.

The product of its (nonzero) digits is 11664, while the sum is 38.

The spelling of 191601666101 in words is "one hundred ninety-one billion, six hundred one million, six hundred sixty-six thousand, one hundred one".