80661829 has 4 divisors (see below), whose sum is σ = 80881984. Its totient is φ = 80441676.

The previous prime is 80661827. The next prime is 80661863. The reversal of 80661829 is 92816608.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 80661829 - 2¹ = 80661827 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 80661791 and 80661800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80661827) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 109527 + ... + 110260.

It is an arithmetic number, because the mean of its divisors is an integer number (20220496).

Almost surely, 2^80661829 is an apocalyptic number.

It is an amenable number.

80661829 is a deficient number, since it is larger than the sum of its proper divisors (220155).

80661829 is a wasteful number, since it uses less digits than its factorization.

80661829 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220154.

The product of its (nonzero) digits is 41472, while the sum is 40.

The square root of 80661829 is about 8981.1930721926. The cubic root of 80661829 is about 432.0718991126.

The spelling of 80661829 in words is "eighty million, six hundred sixty-one thousand, eight hundred twenty-nine".