161995786 has 8 divisors (see below), whose sum is σ = 255782880. Its totient is φ = 76734828.

The previous prime is 161995781. The next prime is 161995807. The reversal of 161995786 is 687599161.

161995786 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not an unprimeable number, because it can be changed into a prime (161995781) 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, 2131486 + ... + 2131561.

It is an arithmetic number, because the mean of its divisors is an integer number (31972860).

Almost surely, 2^161995786 is an apocalyptic number.

161995786 is a deficient number, since it is larger than the sum of its proper divisors (93787094).

161995786 is a wasteful number, since it uses less digits than its factorization.

161995786 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4263068.

The product of its digits is 816480, while the sum is 52.

The square root of 161995786 is about 12727.7565187271. The cubic root of 161995786 is about 545.1314510518.

The spelling of 161995786 in words is "one hundred sixty-one million, nine hundred ninety-five thousand, seven hundred eighty-six".