145317639618 has 54 divisors (see below), whose sum is σ = 332368652889. Its totient is φ = 45880077024.

The previous prime is 145317639587. The next prime is 145317639653. The reversal of 145317639618 is 816936713541.

145317639618 is a `hidden beast` number, since 1 + 4 + 5 + 3 + 17 + 6 + 3 + 9 + 618 = 666.

145317639618 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 93307644369 + 52009995249 = 305463^2 + 228057^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=269553.

It is a super-2 number, since 2×145317639618² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 30726678 + ... + 30731406.

Almost surely, 2^145317639618 is an apocalyptic number.

145317639618 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 145317639618

145317639618 is an abundant number, since it is smaller than the sum of its proper divisors (187051013271).

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

145317639618 is an frugal number, since it uses more digits than its factorization.

145317639618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9504 (or 4753 counting only the distinct ones).

The product of its digits is 3265920, while the sum is 54.

The spelling of 145317639618 in words is "one hundred forty-five billion, three hundred seventeen million, six hundred thirty-nine thousand, six hundred eighteen".