81016357761 has 16 divisors (see below), whose sum is σ = 124163001600. Its totient is φ = 52148459664.

The previous prime is 81016357753. The next prime is 81016357769. The reversal of 81016357761 is 16775361018.

81016357761 is a `hidden beast` number, since 8 + 1 + 0 + 1 + 635 + 7 + 7 + 6 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (81016357753) and next prime (81016357769).

It is not a de Polignac number, because 81016357761 - 2³ = 81016357753 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81016357769) 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, 51733801 + ... + 51735366.

It is an arithmetic number, because the mean of its divisors is an integer number (7760187600).

Almost surely, 2^81016357761 is an apocalyptic number.

It is an amenable number.

81016357761 is a deficient number, since it is larger than the sum of its proper divisors (43146643839).

81016357761 is a wasteful number, since it uses less digits than its factorization.

81016357761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103469205 (or 103469199 counting only the distinct ones).

The product of its (nonzero) digits is 211680, while the sum is 45.

The spelling of 81016357761 in words is "eighty-one billion, sixteen million, three hundred fifty-seven thousand, seven hundred sixty-one".