81045660994176 has 64 divisors (see below), whose sum is σ = 215369263968480. Its totient is φ = 27003709498368.

The previous prime is 81045660994157. The next prime is 81045660994237. The reversal of 81045660994176 is 67149906654018.

It is a tau number, because it is divible by the number of its divisors (64).

It is a super-2 number, since 2×81045660994176² (a number of 29 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44061771 + ... + 45864266.

Almost surely, 2^{81045660994176} is an apocalyptic number.

It is an amenable number.

81045660994176 is an abundant number, since it is smaller than the sum of its proper divisors (134323602974304).

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

81045660994176 is a wasteful number, since it uses less digits than its factorization.

81045660994176 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89928401 (or 89928389 counting only the distinct ones).

The product of its (nonzero) digits is 78382080, while the sum is 66.

The spelling of 81045660994176 in words is "eighty-one trillion, forty-five billion, six hundred sixty million, nine hundred ninety-four thousand, one hundred seventy-six".