161339655529 has 8 divisors (see below), whose sum is σ = 173833601480. Its totient is φ = 148857595776.

The previous prime is 161339655497. The next prime is 161339655557. The reversal of 161339655529 is 925556933161.

It can be written as a sum of positive squares in 4 ways, for example, as 75592003600 + 85747651929 = 274940^2 + 292827^2 .

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 161339655529 - 2⁵ = 161339655497 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 161339655529.

It is not an unprimeable number, because it can be changed into a prime (161339650529) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2943342 + ... + 2997655.

It is an arithmetic number, because the mean of its divisors is an integer number (21729200185).

Almost surely, 2^161339655529 is an apocalyptic number.

It is an amenable number.

161339655529 is a deficient number, since it is larger than the sum of its proper divisors (12493945951).

161339655529 is a wasteful number, since it uses less digits than its factorization.

161339655529 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5943099.

The product of its digits is 6561000, while the sum is 55.

The spelling of 161339655529 in words is "one hundred sixty-one billion, three hundred thirty-nine million, six hundred fifty-five thousand, five hundred twenty-nine".