145021281685665 has 48 divisors (see below), whose sum is σ = 294455084760000. Its totient is φ = 60268584593280.

The previous prime is 145021281685663. The next prime is 145021281685717. The reversal of 145021281685665 is 566586182120541.

It is a happy number.

145021281685665 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 145021281685665 - 2¹ = 145021281685663 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 145021281685599 and 145021281685608.

It is not an unprimeable number, because it can be changed into a prime (145021281685663) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 8968531290 + ... + 8968547459.

It is an arithmetic number, because the mean of its divisors is an integer number (6134480932500).

Almost surely, 2^{145021281685665} is an apocalyptic number.

145021281685665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

145021281685665 is an abundant number, since it is smaller than the sum of its proper divisors (149433803074335).

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

145021281685665 is a wasteful number, since it uses less digits than its factorization.

145021281685665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17937078782 (or 17937078775 counting only the distinct ones).

The product of its (nonzero) digits is 27648000, while the sum is 60.

The spelling of 145021281685665 in words is "one hundred forty-five trillion, twenty-one billion, two hundred eighty-one million, six hundred eighty-five thousand, six hundred sixty-five".