80661358 has 4 divisors (see below), whose sum is σ = 120992040. Its totient is φ = 40330678.

The previous prime is 80661341. The next prime is 80661359. The reversal of 80661358 is 85316608.

It is a semiprime because it is the product of two primes.

It is a congruent number.

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, 20165338 + ... + 20165341.

It is an arithmetic number, because the mean of its divisors is an integer number (30248010).

Almost surely, 2^80661358 is an apocalyptic number.

80661358 is a deficient number, since it is larger than the sum of its proper divisors (40330682).

80661358 is a wasteful number, since it uses less digits than its factorization.

80661358 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40330681.

The product of its (nonzero) digits is 34560, while the sum is 37.

The square root of 80661358 is about 8981.1668506937. The cubic root of 80661358 is about 432.0710581272.

The spelling of 80661358 in words is "eighty million, six hundred sixty-one thousand, three hundred fifty-eight".