81156783895 has 16 divisors (see below), whose sum is σ = 106945205760. Its totient is φ = 58632228000.

The previous prime is 81156783893. The next prime is 81156783899. The reversal of 81156783895 is 59838765118.

It is not a de Polignac number, because 81156783895 - 2¹ = 81156783893 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81156783893) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4877715 + ... + 4894324.

It is an arithmetic number, because the mean of its divisors is an integer number (6684075360).

Almost surely, 2^81156783895 is an apocalyptic number.

81156783895 is a deficient number, since it is larger than the sum of its proper divisors (25788421865).

81156783895 is a wasteful number, since it uses less digits than its factorization.

81156783895 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9772206.

The product of its digits is 14515200, while the sum is 61.

The spelling of 81156783895 in words is "eighty-one billion, one hundred fifty-six million, seven hundred eighty-three thousand, eight hundred ninety-five".