81081135070 has 24 divisors (see below), whose sum is σ = 158036251176. Its totient is φ = 29937649248.

The previous prime is 81081135067. The next prime is 81081135103. The reversal of 81081135070 is 7053118018.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23986812 + ... + 23990191.

It is an arithmetic number, because the mean of its divisors is an integer number (6584843799).

Almost surely, 2^81081135070 is an apocalyptic number.

81081135070 is a deficient number, since it is larger than the sum of its proper divisors (76955116106).

81081135070 is a wasteful number, since it uses less digits than its factorization.

81081135070 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47977036 (or 47977023 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 34.

The spelling of 81081135070 in words is "eighty-one billion, eighty-one million, one hundred thirty-five thousand, seventy".