81754766866 has 16 divisors (see below), whose sum is σ = 123607812384. Its totient is φ = 40553436384.

The previous prime is 81754766831. The next prime is 81754766879. The reversal of 81754766866 is 66866745718.

It is a super-2 number, since 2×81754766866² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 81754766798 and 81754766807.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 189675 + ... + 446638.

It is an arithmetic number, because the mean of its divisors is an integer number (7725488274).

Almost surely, 2^81754766866 is an apocalyptic number.

81754766866 is a deficient number, since it is larger than the sum of its proper divisors (41853045518).

81754766866 is a wasteful number, since it uses less digits than its factorization.

81754766866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 636825.

The product of its digits is 81285120, while the sum is 64.

The spelling of 81754766866 in words is "eighty-one billion, seven hundred fifty-four million, seven hundred sixty-six thousand, eight hundred sixty-six".