81626755762618 has 32 divisors (see below), whose sum is σ = 134010090385920. Its totient is φ = 36981175902000.

The previous prime is 81626755762577. The next prime is 81626755762627.

81626755762618 is nontrivially palindromic in base 10.

81626755762618 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26035563 + ... + 29001793.

It is an arithmetic number, because the mean of its divisors is an integer number (4187815324560).

Almost surely, 2^{81626755762618} is an apocalyptic number.

81626755762618 is a deficient number, since it is larger than the sum of its proper divisors (52383334623302).

81626755762618 is a wasteful number, since it uses less digits than its factorization.

81626755762618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2970354.

The product of its digits is 406425600, while the sum is 70.

The spelling of 81626755762618 in words is "eighty-one trillion, six hundred twenty-six billion, seven hundred fifty-five million, seven hundred sixty-two thousand, six hundred eighteen".