80205386706621 has 80 divisors (see below), whose sum is σ = 134249659619328. Its totient is φ = 47291326416000.

The previous prime is 80205386706617. The next prime is 80205386706629. The reversal of 80205386706621 is 12660768350208.

80205386706621 is a `hidden beast` number, since 8 + 0 + 2 + 0 + 5 + 3 + 8 + 6 + 7 + 0 + 6 + 621 = 666.

It is not a de Polignac number, because 80205386706621 - 2² = 80205386706617 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80205386706629) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 389336196 + ... + 389542146.

Almost surely, 2^{80205386706621} is an apocalyptic number.

80205386706621 is a gapful number since it is divisible by the number (81) formed by its first and last digit.

It is an amenable number.

80205386706621 is a deficient number, since it is larger than the sum of its proper divisors (54044272912707).

80205386706621 is a wasteful number, since it uses less digits than its factorization.

80205386706621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217824 (or 217815 counting only the distinct ones).

The product of its (nonzero) digits is 5806080, while the sum is 54.

The spelling of 80205386706621 in words is "eighty trillion, two hundred five billion, three hundred eighty-six million, seven hundred six thousand, six hundred twenty-one".