81049220745 has 8 divisors (see below), whose sum is σ = 129678753216. Its totient is φ = 43226251056.

The previous prime is 81049220743. The next prime is 81049220761. The reversal of 81049220745 is 54702294018.

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

It is not a de Polignac number, because 81049220745 - 2¹ = 81049220743 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81049220697 and 81049220706.

It is not an unprimeable number, because it can be changed into a prime (81049220743) 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, 2701640677 + ... + 2701640706.

It is an arithmetic number, because the mean of its divisors is an integer number (16209844152).

Almost surely, 2^81049220745 is an apocalyptic number.

It is an amenable number.

81049220745 is a deficient number, since it is larger than the sum of its proper divisors (48629532471).

81049220745 is a wasteful number, since it uses less digits than its factorization.

81049220745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5403281391.

The product of its (nonzero) digits is 161280, while the sum is 42.

The spelling of 81049220745 in words is "eighty-one billion, forty-nine million, two hundred twenty thousand, seven hundred forty-five".