80640824261 has 4 divisors (see below), whose sum is σ = 80717553024. Its totient is φ = 80564095500.

The previous prime is 80640824237. The next prime is 80640824267. The reversal of 80640824261 is 16242804608.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 80640824261 - 2¹⁸ = 80640562117 is a prime.

It is a super-2 number, since 2×80640824261² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80640824267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38362805 + ... + 38364906.

It is an arithmetic number, because the mean of its divisors is an integer number (20179388256).

Almost surely, 2^80640824261 is an apocalyptic number.

It is an amenable number.

80640824261 is a deficient number, since it is larger than the sum of its proper divisors (76728763).

80640824261 is a wasteful number, since it uses less digits than its factorization.

80640824261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76728762.

The product of its (nonzero) digits is 147456, while the sum is 41.

The spelling of 80640824261 in words is "eighty billion, six hundred forty million, eight hundred twenty-four thousand, two hundred sixty-one".