81625852618 has 16 divisors (see below), whose sum is σ = 123959062656. Its totient is φ = 40308290640.

The previous prime is 81625852613. The next prime is 81625852619.

81625852618 is nontrivially palindromic in base 10.

It is not an unprimeable number, because it can be changed into a prime (81625852613) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 454318 + ... + 607993.

It is an arithmetic number, because the mean of its divisors is an integer number (7747441416).

Almost surely, 2^81625852618 is an apocalyptic number.

81625852618 is a deficient number, since it is larger than the sum of its proper divisors (42333210038).

81625852618 is a wasteful number, since it uses less digits than its factorization.

81625852618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1062789.

The product of its digits is 1843200, while the sum is 52.

The spelling of 81625852618 in words is "eighty-one billion, six hundred twenty-five million, eight hundred fifty-two thousand, six hundred eighteen".