81620070283 has 4 divisors (see below), whose sum is σ = 84252975808. Its totient is φ = 78987164760.

The previous prime is 81620070271. The next prime is 81620070289. The reversal of 81620070283 is 38207002618.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 81620070283 - 2⁹ = 81620069771 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81620070289) 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, 1316452716 + ... + 1316452777.

It is an arithmetic number, because the mean of its divisors is an integer number (21063243952).

Almost surely, 2^81620070283 is an apocalyptic number.

81620070283 is a deficient number, since it is larger than the sum of its proper divisors (2632905525).

81620070283 is a wasteful number, since it uses less digits than its factorization.

81620070283 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2632905524.

The product of its (nonzero) digits is 32256, while the sum is 37.

The spelling of 81620070283 in words is "eighty-one billion, six hundred twenty million, seventy thousand, two hundred eighty-three".