161040618 has 96 divisors (see below), whose sum is σ = 390873600. Its totient is φ = 47681568.

The previous prime is 161040611. The next prime is 161040647. The reversal of 161040618 is 816040161.

161040618 is a `hidden beast` number, since 1 + 6 + 1 + 0 + 40 + 618 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 161040591 and 161040600.

It is not an unprimeable number, because it can be changed into a prime (161040611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 463921 + ... + 464267.

It is an arithmetic number, because the mean of its divisors is an integer number (4071600).

Almost surely, 2^161040618 is an apocalyptic number.

161040618 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 161040618, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (195436800).

161040618 is an abundant number, since it is smaller than the sum of its proper divisors (229832982).

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

161040618 is a wasteful number, since it uses less digits than its factorization.

161040618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 456 (or 453 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 161040618 is about 12690.1780129358. The cubic root of 161040618 is about 544.0579275288.

Adding to 161040618 its reverse (816040161), we get a palindrome (977080779).

The spelling of 161040618 in words is "one hundred sixty-one million, forty thousand, six hundred eighteen".