81036747077 has 32 divisors (see below), whose sum is σ = 95742259200. Its totient is φ = 67619448000.

The previous prime is 81036747053. The next prime is 81036747079. The reversal of 81036747077 is 77074763018.

It is not a de Polignac number, because 81036747077 - 2²⁰ = 81035698501 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81036747079) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23211302 + ... + 23214792.

It is an arithmetic number, because the mean of its divisors is an integer number (2991945600).

Almost surely, 2^81036747077 is an apocalyptic number.

It is an amenable number.

81036747077 is a deficient number, since it is larger than the sum of its proper divisors (14705512123).

81036747077 is a wasteful number, since it uses less digits than its factorization.

81036747077 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4385.

The product of its (nonzero) digits is 1382976, while the sum is 50.

The spelling of 81036747077 in words is "eighty-one billion, thirty-six million, seven hundred forty-seven thousand, seventy-seven".