161505065110501 has 12 divisors (see below), whose sum is σ = 187873848673248. Its totient is φ = 138432463723512.

The previous prime is 161505065110451. The next prime is 161505065110549. The reversal of 161505065110501 is 105011560505161.

It is not a de Polignac number, because 161505065110501 - 2¹⁹ = 161505064586213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161505065110561) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10372600 + ... + 20750926.

It is an arithmetic number, because the mean of its divisors is an integer number (15656154056104).

Almost surely, 2^{161505065110501} is an apocalyptic number.

It is an amenable number.

161505065110501 is a deficient number, since it is larger than the sum of its proper divisors (26368783562747).

161505065110501 is a wasteful number, since it uses less digits than its factorization.

161505065110501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10695928 (or 10695921 counting only the distinct ones).

The product of its (nonzero) digits is 22500, while the sum is 37.

The spelling of 161505065110501 in words is "one hundred sixty-one trillion, five hundred five billion, sixty-five million, one hundred ten thousand, five hundred one".