161311390653 has 24 divisors (see below), whose sum is σ = 254437904160. Its totient is φ = 90615594720.

The previous prime is 161311390649. The next prime is 161311390687. The reversal of 161311390653 is 356093113161.

It is not a de Polignac number, because 161311390653 - 2² = 161311390649 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161311390633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9290958 + ... + 9308303.

It is an arithmetic number, because the mean of its divisors is an integer number (10601579340).

Almost surely, 2^161311390653 is an apocalyptic number.

It is an amenable number.

161311390653 is a deficient number, since it is larger than the sum of its proper divisors (93126513507).

161311390653 is a wasteful number, since it uses less digits than its factorization.

161311390653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18599337 (or 18599330 counting only the distinct ones).

The product of its (nonzero) digits is 43740, while the sum is 39.

The spelling of 161311390653 in words is "one hundred sixty-one billion, three hundred eleven million, three hundred ninety thousand, six hundred fifty-three".