80661356 has 6 divisors (see below), whose sum is σ = 141157380. Its totient is φ = 40330676.

The previous prime is 80661341. The next prime is 80661359. The reversal of 80661356 is 65316608.

It is not an unprimeable number, because it can be changed into a prime (80661359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10082666 + ... + 10082673.

It is an arithmetic number, because the mean of its divisors is an integer number (23526230).

Almost surely, 2^80661356 is an apocalyptic number.

It is an amenable number.

80661356 is a deficient number, since it is larger than the sum of its proper divisors (60496024).

80661356 is a wasteful number, since it uses less digits than its factorization.

80661356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20165343 (or 20165341 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 80661356 is about 8981.1667393496. The cubic root of 80661356 is about 432.0710545562.

The spelling of 80661356 in words is "eighty million, six hundred sixty-one thousand, three hundred fifty-six".