80621566 has 8 divisors (see below), whose sum is σ = 125102520. Its totient is φ = 38920728.

The previous prime is 80621561. The next prime is 80621609. The reversal of 80621566 is 66512608.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80621561) 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, 694956 + ... + 695071.

It is an arithmetic number, because the mean of its divisors is an integer number (15637815).

Almost surely, 2^80621566 is an apocalyptic number.

80621566 is a deficient number, since it is larger than the sum of its proper divisors (44480954).

80621566 is a wasteful number, since it uses less digits than its factorization.

80621566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1390058.

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 80621566 is about 8978.9512750655. The cubic root of 80621566 is about 431.9999964278. Note that the first 5 decimals are identical.

The spelling of 80621566 in words is "eighty million, six hundred twenty-one thousand, five hundred sixty-six".