81016277531777 has 16 divisors (see below), whose sum is σ = 92624672465280. Its totient is φ = 69416547758208.

The previous prime is 81016277531773. The next prime is 81016277531779. The reversal of 81016277531777 is 77713577261018.

It is a happy number.

It is not a de Polignac number, because 81016277531777 - 2² = 81016277531773 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81016277531771) 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, 203176883 + ... + 203575239.

It is an arithmetic number, because the mean of its divisors is an integer number (5789042029080).

Almost surely, 2^{81016277531777} is an apocalyptic number.

It is an amenable number.

81016277531777 is a deficient number, since it is larger than the sum of its proper divisors (11608394933503).

81016277531777 is a wasteful number, since it uses less digits than its factorization.

81016277531777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 409160.

The product of its (nonzero) digits is 24202080, while the sum is 62.

The spelling of 81016277531777 in words is "eighty-one trillion, sixteen billion, two hundred seventy-seven million, five hundred thirty-one thousand, seven hundred seventy-seven".