81536167708 has 6 divisors (see below), whose sum is σ = 142688293496. Its totient is φ = 40768083852.

The previous prime is 81536167673. The next prime is 81536167747. The reversal of 81536167708 is 80776163518.

It is a super-3 number, since 3×81536167708³ (a number of 34 digits) contains 333 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, 10192020960 + ... + 10192020967.

Almost surely, 2^81536167708 is an apocalyptic number.

It is an amenable number.

81536167708 is a deficient number, since it is larger than the sum of its proper divisors (61152125788).

81536167708 is a wasteful number, since it uses less digits than its factorization.

81536167708 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20384041931 (or 20384041929 counting only the distinct ones).

The product of its (nonzero) digits is 1693440, while the sum is 52.

The spelling of 81536167708 in words is "eighty-one billion, five hundred thirty-six million, one hundred sixty-seven thousand, seven hundred eight".