261815518162 has 8 divisors (see below), whose sum is σ = 428425393392. Its totient is φ = 119007053700.

The previous prime is 261815518123. The next prime is 261815518163.

It is a happy number.

261815518162 is nontrivially palindromic in base 10.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (261815518163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5950352664 + ... + 5950352707.

It is an arithmetic number, because the mean of its divisors is an integer number (53553174174).

Almost surely, 2^261815518162 is an apocalyptic number.

261815518162 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

261815518162 is a deficient number, since it is larger than the sum of its proper divisors (166609875230).

261815518162 is a wasteful number, since it uses less digits than its factorization.

261815518162 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11900705384.

The product of its digits is 230400, while the sum is 46.

It can be divided in two parts, 261815 and 518162, that added together give a palindrome (779977).

The spelling of 261815518162 in words is "two hundred sixty-one billion, eight hundred fifteen million, five hundred eighteen thousand, one hundred sixty-two".