80423978129 has 4 divisors (see below), whose sum is σ = 87735248880. Its totient is φ = 73112707380.

The previous prime is 80423978113. The next prime is 80423978171. The reversal of 80423978129 is 92187932408.

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 80423978129 - 2⁴ = 80423978113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (80423978179) 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, 3655635359 + ... + 3655635380.

It is an arithmetic number, because the mean of its divisors is an integer number (21933812220).

Almost surely, 2^80423978129 is an apocalyptic number.

It is an amenable number.

80423978129 is a deficient number, since it is larger than the sum of its proper divisors (7311270751).

80423978129 is a wasteful number, since it uses less digits than its factorization.

80423978129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7311270750.

The product of its (nonzero) digits is 1741824, while the sum is 53.

The spelling of 80423978129 in words is "eighty billion, four hundred twenty-three million, nine hundred seventy-eight thousand, one hundred twenty-nine".