81350437777 has 8 divisors (see below), whose sum is σ = 92995048256. Its totient is φ = 69711607152.

The previous prime is 81350437759. The next prime is 81350437793. The reversal of 81350437777 is 77773405318.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81350437777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81350437717) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1414758 + ... + 1471135.

It is an arithmetic number, because the mean of its divisors is an integer number (11624381032).

Almost surely, 2^81350437777 is an apocalyptic number.

It is an amenable number.

81350437777 is a deficient number, since it is larger than the sum of its proper divisors (11644610479).

81350437777 is a wasteful number, since it uses less digits than its factorization.

81350437777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2889927.

The product of its (nonzero) digits is 3457440, while the sum is 52.

The spelling of 81350437777 in words is "eighty-one billion, three hundred fifty million, four hundred thirty-seven thousand, seven hundred seventy-seven".