161440056611 has 4 divisors (see below), whose sum is σ = 161855070000. Its totient is φ = 161025043224.

The previous prime is 161440056599. The next prime is 161440056619. The reversal of 161440056611 is 116650044161.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161440056611 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161440056619) 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, 207506111 + ... + 207506888.

It is an arithmetic number, because the mean of its divisors is an integer number (40463767500).

Almost surely, 2^161440056611 is an apocalyptic number.

161440056611 is a deficient number, since it is larger than the sum of its proper divisors (415013389).

161440056611 is an equidigital number, since it uses as much as digits as its factorization.

161440056611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 415013388.

The product of its (nonzero) digits is 17280, while the sum is 35.

The spelling of 161440056611 in words is "one hundred sixty-one billion, four hundred forty million, fifty-six thousand, six hundred eleven".