80521659 has 6 divisors (see below), whose sum is σ = 116309076. Its totient is φ = 53681100.

The previous prime is 80521633. The next prime is 80521687. The reversal of 80521659 is 95612508.

It is a happy number.

80521659 is a `hidden beast` number, since 80 + 521 + 6 + 59 = 666.

It is not a de Polignac number, because 80521659 - 2⁵ = 80521627 is a prime.

It is a super-2 number, since 2×80521659² = 12967475136224562, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (80521559) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4473417 + ... + 4473434.

It is an arithmetic number, because the mean of its divisors is an integer number (19384846).

Almost surely, 2^80521659 is an apocalyptic number.

80521659 is a deficient number, since it is larger than the sum of its proper divisors (35787417).

80521659 is a wasteful number, since it uses less digits than its factorization.

80521659 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8946857 (or 8946854 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 36.

The square root of 80521659 is about 8973.3861501665. The cubic root of 80521659 is about 431.8214765185.

The spelling of 80521659 in words is "eighty million, five hundred twenty-one thousand, six hundred fifty-nine".