80421504665 has 8 divisors (see below), whose sum is σ = 102182617800. Its totient is φ = 60552662272.

The previous prime is 80421504613. The next prime is 80421504689. The reversal of 80421504665 is 56640512408.

It can be written as a sum of positive squares in 4 ways, for example, as 17911004224 + 62510500441 = 133832^2 + 250021^2 .

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 80421504665 - 2⁶ = 80421504601 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 473067590 + ... + 473067759.

It is an arithmetic number, because the mean of its divisors is an integer number (12772827225).

Almost surely, 2^80421504665 is an apocalyptic number.

80421504665 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

It is an amenable number.

80421504665 is a deficient number, since it is larger than the sum of its proper divisors (21761113135).

80421504665 is a wasteful number, since it uses less digits than its factorization.

80421504665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 946135371.

The product of its (nonzero) digits is 230400, while the sum is 41.

The spelling of 80421504665 in words is "eighty billion, four hundred twenty-one million, five hundred four thousand, six hundred sixty-five".