161005060661 has 4 divisors (see below), whose sum is σ = 161019093312. Its totient is φ = 160991028012.

The previous prime is 161005060633. The next prime is 161005060663. The reversal of 161005060661 is 166060500161.

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 a de Polignac number, because none of the positive numbers 2^k-161005060661 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 (161005060663) 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, 6999101 + ... + 7022066.

It is an arithmetic number, because the mean of its divisors is an integer number (40254773328).

Almost surely, 2^161005060661 is an apocalyptic number.

It is an amenable number.

161005060661 is a deficient number, since it is larger than the sum of its proper divisors (14032651).

161005060661 is a wasteful number, since it uses less digits than its factorization.

161005060661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14032650.

The product of its (nonzero) digits is 6480, while the sum is 32.

The spelling of 161005060661 in words is "one hundred sixty-one billion, five million, sixty thousand, six hundred sixty-one".