81612131160 has 64 divisors (see below), whose sum is σ = 279813024000. Its totient is φ = 18654201216.

The previous prime is 81612131131. The next prime is 81612131173. The reversal of 81612131160 is 6113121618.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48577810 + ... + 48579489.

It is an arithmetic number, because the mean of its divisors is an integer number (4372078500).

Almost surely, 2^81612131160 is an apocalyptic number.

It is an amenable number.

81612131160 is an abundant number, since it is smaller than the sum of its proper divisors (198200892840).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81612131160 is a wasteful number, since it uses less digits than its factorization.

81612131160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97157320 (or 97157316 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 30.

Adding to 81612131160 its reverse (6113121618), we get a palindrome (87725252778).

The spelling of 81612131160 in words is "eighty-one billion, six hundred twelve million, one hundred thirty-one thousand, one hundred sixty".