81335568070 has 8 divisors (see below), whose sum is σ = 146404022544. Its totient is φ = 32534227224.

The previous prime is 81335568059. The next prime is 81335568071. The reversal of 81335568070 is 7086553318.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 81335568070.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81335568071) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4066778394 + ... + 4066778413.

It is an arithmetic number, because the mean of its divisors is an integer number (18300502818).

Almost surely, 2^81335568070 is an apocalyptic number.

81335568070 is a deficient number, since it is larger than the sum of its proper divisors (65068454474).

81335568070 is a wasteful number, since it uses less digits than its factorization.

81335568070 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8133556814.

The product of its (nonzero) digits is 604800, while the sum is 46.

The spelling of 81335568070 in words is "eighty-one billion, three hundred thirty-five million, five hundred sixty-eight thousand, seventy".