816162261618 has 48 divisors (see below), whose sum is σ = 1794649076640. Its totient is φ = 247261090560.

The previous prime is 816162261539. The next prime is 816162261619.

816162261618 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×816162261618² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (816162261619) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2861521 + ... + 3133787.

It is an arithmetic number, because the mean of its divisors is an integer number (37388522430).

Almost surely, 2^816162261618 is an apocalyptic number.

816162261618 is an abundant number, since it is smaller than the sum of its proper divisors (978486815022).

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

816162261618 is a wasteful number, since it uses less digits than its factorization.

816162261618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276423 (or 276412 counting only the distinct ones).

The product of its digits is 331776, while the sum is 48.

The spelling of 816162261618 in words is "eight hundred sixteen billion, one hundred sixty-two million, two hundred sixty-one thousand, six hundred eighteen".