78804553431 has 4 divisors (see below), whose sum is σ = 105072737912. Its totient is φ = 52536368952.

The previous prime is 78804553427. The next prime is 78804553441. The reversal of 78804553431 is 13435540887.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 78804553431 - 2² = 78804553427 is a prime.

It is a super-2 number, since 2×78804553431² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78804553411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13134092236 + ... + 13134092241.

It is an arithmetic number, because the mean of its divisors is an integer number (26268184478).

Almost surely, 2^78804553431 is an apocalyptic number.

78804553431 is a deficient number, since it is larger than the sum of its proper divisors (26268184481).

78804553431 is a wasteful number, since it uses less digits than its factorization.

78804553431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26268184480.

The product of its (nonzero) digits is 1612800, while the sum is 48.

The spelling of 78804553431 in words is "seventy-eight billion, eight hundred four million, five hundred fifty-three thousand, four hundred thirty-one".