80418916821 has 4 divisors (see below), whose sum is σ = 107225222432. Its totient is φ = 53612611212.

The previous prime is 80418916819. The next prime is 80418916859. The reversal of 80418916821 is 12861981408.

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 not a de Polignac number, because 80418916821 - 2¹ = 80418916819 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80418916861) 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, 13403152801 + ... + 13403152806.

It is an arithmetic number, because the mean of its divisors is an integer number (26806305608).

Almost surely, 2^80418916821 is an apocalyptic number.

It is an amenable number.

80418916821 is a deficient number, since it is larger than the sum of its proper divisors (26806305611).

80418916821 is a wasteful number, since it uses less digits than its factorization.

80418916821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26806305610.

The product of its (nonzero) digits is 221184, while the sum is 48.

The spelling of 80418916821 in words is "eighty billion, four hundred eighteen million, nine hundred sixteen thousand, eight hundred twenty-one".