80997612066 has 256 divisors, whose sum is σ = 221185843200. Its totient is φ = 21457094400.

The previous prime is 80997612041. The next prime is 80997612083. The reversal of 80997612066 is 66021679908.

It is a super-2 number, since 2×80997612066² (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 127 ways as a sum of consecutive naturals, for example, 128363571 + ... + 128364201.

It is an arithmetic number, because the mean of its divisors is an integer number (864007200).

Almost surely, 2^80997612066 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 80997612066, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (110592921600).

80997612066 is an abundant number, since it is smaller than the sum of its proper divisors (140188231134).

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

80997612066 is a wasteful number, since it uses less digits than its factorization.

80997612066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1022 (or 1016 counting only the distinct ones).

The product of its (nonzero) digits is 1959552, while the sum is 54.

The spelling of 80997612066 in words is "eighty billion, nine hundred ninety-seven million, six hundred twelve thousand, sixty-six".