80978870821 has 8 divisors (see below), whose sum is σ = 82192623264. Its totient is φ = 79765268880.

The previous prime is 80978870803. The next prime is 80978870849. The reversal of 80978870821 is 12807887908.

It is a happy number.

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 80978870821 - 2¹⁷ = 80978739749 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 (80978871821) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1534551 + ... + 1586443.

It is an arithmetic number, because the mean of its divisors is an integer number (10274077908).

Almost surely, 2^80978870821 is an apocalyptic number.

It is an amenable number.

80978870821 is a deficient number, since it is larger than the sum of its proper divisors (1213752443).

80978870821 is a wasteful number, since it uses less digits than its factorization.

80978870821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75251.

The product of its (nonzero) digits is 3612672, while the sum is 58.

The spelling of 80978870821 in words is "eighty billion, nine hundred seventy-eight million, eight hundred seventy thousand, eight hundred twenty-one".