161500011100065 has 64 divisors (see below), whose sum is σ = 331636386481920. Its totient is φ = 73696974750720.

The previous prime is 161500011100037. The next prime is 161500011100091. The reversal of 161500011100065 is 560001110005161.

161500011100065 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 161500011100065 - 2¹⁹ = 161500010575777 is a prime.

It is a super-2 number, since 2×161500011100065² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3198628174 + ... + 3198678663.

It is an arithmetic number, because the mean of its divisors is an integer number (5181818538780).

Almost surely, 2^{161500011100065} is an apocalyptic number.

161500011100065 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

161500011100065 is an abundant number, since it is smaller than the sum of its proper divisors (170136375381855).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161500011100065 is a wasteful number, since it uses less digits than its factorization.

161500011100065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6397306879 (or 6397306873 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 27.

The spelling of 161500011100065 in words is "one hundred sixty-one trillion, five hundred billion, eleven million, one hundred thousand, sixty-five".