80205963921 has 12 divisors (see below), whose sum is σ = 116765289472. Its totient is φ = 53049613176.

The previous prime is 80205963919. The next prime is 80205963949. The reversal of 80205963921 is 12936950208.

80205963921 is a `hidden beast` number, since 8 + 0 + 2 + 0 + 5 + 9 + 639 + 2 + 1 = 666.

It is not a de Polignac number, because 80205963921 - 2¹ = 80205963919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (80205963221) 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 11 ways as a sum of consecutive naturals, for example, 35084581 + ... + 35086866.

Almost surely, 2^80205963921 is an apocalyptic number.

It is an amenable number.

80205963921 is a deficient number, since it is larger than the sum of its proper divisors (36559325551).

80205963921 is a wasteful number, since it uses less digits than its factorization.

80205963921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70171580 (or 70171577 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 45.

The spelling of 80205963921 in words is "eighty billion, two hundred five million, nine hundred sixty-three thousand, nine hundred twenty-one".