81210429618 has 64 divisors (see below), whose sum is σ = 173627089920. Its totient is φ = 25266528000.

The previous prime is 81210429583. The next prime is 81210429689. The reversal of 81210429618 is 81692401218.

It is a self number, because there is not a number n which added to its sum of digits gives 81210429618.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5370268 + ... + 5385368.

It is an arithmetic number, because the mean of its divisors is an integer number (2712923280).

Almost surely, 2^81210429618 is an apocalyptic number.

81210429618 is an abundant number, since it is smaller than the sum of its proper divisors (92416660302).

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

81210429618 is a wasteful number, since it uses less digits than its factorization.

81210429618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16163.

The product of its (nonzero) digits is 55296, while the sum is 42.

The spelling of 81210429618 in words is "eighty-one billion, two hundred ten million, four hundred twenty-nine thousand, six hundred eighteen".