80661601 has 8 divisors (see below), whose sum is σ = 82459944. Its totient is φ = 78873600.

The previous prime is 80661599. The next prime is 80661613. The reversal of 80661601 is 10616608.

It can be written as a sum of positive squares in 4 ways, for example, as 5856400 + 74805201 = 2420^2 + 8649^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 80661601 - 2¹ = 80661599 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 80661601.

It is not an unprimeable number, because it can be changed into a prime (80661661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14401 + ... + 19201.

It is an arithmetic number, because the mean of its divisors is an integer number (10307493).

Almost surely, 2^80661601 is an apocalyptic number.

80661601 is the 4801-st nonagonal number.

It is an amenable number.

80661601 is a deficient number, since it is larger than the sum of its proper divisors (1798343).

80661601 is a wasteful number, since it uses less digits than its factorization.

80661601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5171.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 80661601 is about 8981.1803789925. The cubic root of 80661601 is about 432.0714920118.

The spelling of 80661601 in words is "eighty million, six hundred sixty-one thousand, six hundred one".