161011666613 has 8 divisors (see below), whose sum is σ = 184335602880. Its totient is φ = 137768297760.

The previous prime is 161011666573. The next prime is 161011666643. The reversal of 161011666613 is 316666110161.

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

It is a cyclic number.

It is not a de Polignac number, because 161011666613 - 2⁶ = 161011666549 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 (161011666643) 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, 20137568 + ... + 20145561.

It is an arithmetic number, because the mean of its divisors is an integer number (23041950360).

Almost surely, 2^161011666613 is an apocalyptic number.

It is an amenable number.

161011666613 is a deficient number, since it is larger than the sum of its proper divisors (23323936267).

161011666613 is an equidigital number, since it uses as much as digits as its factorization.

161011666613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40283707.

The product of its (nonzero) digits is 23328, while the sum is 38.

Adding to 161011666613 its reverse (316666110161), we get a palindrome (477677776774).

The spelling of 161011666613 in words is "one hundred sixty-one billion, eleven million, six hundred sixty-six thousand, six hundred thirteen".