81760215524456 has 64 divisors (see below), whose sum is σ = 175938019246080. Its totient is φ = 34892643672000.

The previous prime is 81760215524293. The next prime is 81760215524459. The reversal of 81760215524456 is 65442551206718.

It is a happy number.

It is a super-2 number, since 2×81760215524456² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (56).

It is not an unprimeable number, because it can be changed into a prime (81760215524459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 62080265 + ... + 63383591.

It is an arithmetic number, because the mean of its divisors is an integer number (2749031550720).

Almost surely, 2^{81760215524456} is an apocalyptic number.

It is an amenable number.

81760215524456 is an abundant number, since it is smaller than the sum of its proper divisors (94177803721624).

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

81760215524456 is a wasteful number, since it uses less digits than its factorization.

81760215524456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1308054 (or 1308050 counting only the distinct ones).

The product of its (nonzero) digits is 16128000, while the sum is 56.

The spelling of 81760215524456 in words is "eighty-one trillion, seven hundred sixty billion, two hundred fifteen million, five hundred twenty-four thousand, four hundred fifty-six".