81751610602712 has 8 divisors (see below), whose sum is σ = 153284269880100. Its totient is φ = 40875805301352.

The previous prime is 81751610602691. The next prime is 81751610602741. The reversal of 81751610602712 is 21720601615718.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×81751610602712² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5109475662662 + ... + 5109475662677.

Almost surely, 2^{81751610602712} is an apocalyptic number.

It is an amenable number.

81751610602712 is a deficient number, since it is larger than the sum of its proper divisors (71532659277388).

81751610602712 is a wasteful number, since it uses less digits than its factorization.

81751610602712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10218951325345 (or 10218951325341 counting only the distinct ones).

The product of its (nonzero) digits is 282240, while the sum is 47.

The spelling of 81751610602712 in words is "eighty-one trillion, seven hundred fifty-one billion, six hundred ten million, six hundred two thousand, seven hundred twelve".