161081946956 has 24 divisors (see below), whose sum is σ = 322868873376. Its totient is φ = 68884053120.

The previous prime is 161081946923. The next prime is 161081946979. The reversal of 161081946956 is 659649180161.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6281435 + ... + 6307026.

It is an arithmetic number, because the mean of its divisors is an integer number (13452869724).

Almost surely, 2^161081946956 is an apocalyptic number.

It is an amenable number.

161081946956 is an abundant number, since it is smaller than the sum of its proper divisors (161786926420).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161081946956 is a wasteful number, since it uses less digits than its factorization.

161081946956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12588929 (or 12588927 counting only the distinct ones).

The product of its (nonzero) digits is 2799360, while the sum is 56.

The spelling of 161081946956 in words is "one hundred sixty-one billion, eighty-one million, nine hundred forty-six thousand, nine hundred fifty-six".