81667822876618 has 16 divisors (see below), whose sum is σ = 136481622758784. Its totient is φ = 36331913464960.

The previous prime is 81667822876603. The next prime is 81667822876639.

81667822876618 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×81667822876618² (a number of 29 digits) contains 22 as substring.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 39491209255 + ... + 39491211322.

It is an arithmetic number, because the mean of its divisors is an integer number (8530101422424).

Almost surely, 2^{81667822876618} is an apocalyptic number.

81667822876618 is a deficient number, since it is larger than the sum of its proper divisors (54813799882166).

81667822876618 is a wasteful number, since it uses less digits than its factorization.

81667822876618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78982420637.

The product of its digits is 1040449536, while the sum is 76.

The spelling of 81667822876618 in words is "eighty-one trillion, six hundred sixty-seven billion, eight hundred twenty-two million, eight hundred seventy-six thousand, six hundred eighteen".