161310320639 has 8 divisors (see below), whose sum is σ = 174332658192. Its totient is φ = 148375676160.

The previous prime is 161310320617. The next prime is 161310320653. The reversal of 161310320639 is 936023013161.

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

It is a cyclic number.

It is not a de Polignac number, because 161310320639 - 2⁸ = 161310320383 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 161310320599 and 161310320608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161310320609) 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 7 ways as a sum of consecutive naturals, for example, 21919442 + ... + 21926799.

It is an arithmetic number, because the mean of its divisors is an integer number (21791582274).

Almost surely, 2^161310320639 is an apocalyptic number.

161310320639 is a deficient number, since it is larger than the sum of its proper divisors (13022337553).

161310320639 is a wasteful number, since it uses less digits than its factorization.

161310320639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43846537.

The product of its (nonzero) digits is 17496, while the sum is 35.

The spelling of 161310320639 in words is "one hundred sixty-one billion, three hundred ten million, three hundred twenty thousand, six hundred thirty-nine".