161500555605 has 8 divisors (see below), whose sum is σ = 258400888992. Its totient is φ = 86133629648.

The previous prime is 161500555583. The next prime is 161500555613. The reversal of 161500555605 is 506555005161.

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 161500555605 - 2⁷ = 161500555477 is a prime.

It is a congruent number.

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, 5383351839 + ... + 5383351868.

It is an arithmetic number, because the mean of its divisors is an integer number (32300111124).

Almost surely, 2^161500555605 is an apocalyptic number.

161500555605 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

161500555605 is a deficient number, since it is larger than the sum of its proper divisors (96900333387).

161500555605 is a wasteful number, since it uses less digits than its factorization.

161500555605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10766703715.

The product of its (nonzero) digits is 112500, while the sum is 39.

The spelling of 161500555605 in words is "one hundred sixty-one billion, five hundred million, five hundred fifty-five thousand, six hundred five".