80691966 has 12 divisors (see below), whose sum is σ = 174832632. Its totient is φ = 26897316.

The previous prime is 80691953. The next prime is 80691967. The reversal of 80691966 is 66919608.

It is a super-2 number, since 2×80691966² = 13022386753890312, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80691967) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2241426 + ... + 2241461.

It is an arithmetic number, because the mean of its divisors is an integer number (14569386).

Almost surely, 2^80691966 is an apocalyptic number.

80691966 is an abundant number, since it is smaller than the sum of its proper divisors (94140666).

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

80691966 is a wasteful number, since it uses less digits than its factorization.

80691966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4482895 (or 4482892 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 45.

The square root of 80691966 is about 8982.8706992809. The cubic root of 80691966 is about 432.1257028743.

The spelling of 80691966 in words is "eighty million, six hundred ninety-one thousand, nine hundred sixty-six".