80645173056 has 336 divisors, whose sum is σ = 276258528000. Its totient is φ = 21992103936.

The previous prime is 80645173013. The next prime is 80645173099. The reversal of 80645173056 is 65037154608.

80645173056 is a `hidden beast` number, since 80 + 6 + 4 + 517 + 3 + 0 + 56 = 666.

It is an interprime number because it is at equal distance from previous prime (80645173013) and next prime (80645173099).

It is a tau number, because it is divible by the number of its divisors (336).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 76877620 + ... + 76878668.

It is an arithmetic number, because the mean of its divisors is an integer number (822198000).

Almost surely, 2^80645173056 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 80645173056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (138129264000).

80645173056 is an abundant number, since it is smaller than the sum of its proper divisors (195613354944).

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

80645173056 is a wasteful number, since it uses less digits than its factorization.

80645173056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1926 (or 1913 counting only the distinct ones).

The product of its (nonzero) digits is 604800, while the sum is 45.

The spelling of 80645173056 in words is "eighty billion, six hundred forty-five million, one hundred seventy-three thousand, fifty-six".