81042667776 has 144 divisors (see below), whose sum is σ = 273894364800. Its totient is φ = 23155034112.

The previous prime is 81042667757. The next prime is 81042667781. The reversal of 81042667776 is 67776624018.

81042667776 is a `hidden beast` number, since 81 + 0 + 426 + 6 + 77 + 76 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is a super-2 number, since 2×81042667776² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

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, 789111 + ... + 885878.

It is an arithmetic number, because the mean of its divisors is an integer number (1902044200).

Almost surely, 2^81042667776 is an apocalyptic number.

It is an amenable number.

81042667776 is an abundant number, since it is smaller than the sum of its proper divisors (192851697024).

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

81042667776 is a wasteful number, since it uses less digits than its factorization.

81042667776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1675021 (or 1675001 counting only the distinct ones).

The product of its (nonzero) digits is 4741632, while the sum is 54.

The spelling of 81042667776 in words is "eighty-one billion, forty-two million, six hundred sixty-seven thousand, seven hundred seventy-six".