78273231742447 has 6 divisors (see below), whose sum is σ = 91052534884128. Its totient is φ = 67091341493484.

The previous prime is 78273231742429. The next prime is 78273231742507. The reversal of 78273231742447 is 74424713237287.

It is a de Polignac number, because none of the positive numbers 2^k-78273231742447 is a prime.

It is a super-2 number, since 2×78273231742447² (a number of 29 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 (78273211742447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 798706446303 + ... + 798706446400.

It is an arithmetic number, because the mean of its divisors is an integer number (15175422480688).

Almost surely, 2^{78273231742447} is an apocalyptic number.

78273231742447 is a deficient number, since it is larger than the sum of its proper divisors (12779303141681).

78273231742447 is a wasteful number, since it uses less digits than its factorization.

78273231742447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1597412892717 (or 1597412892710 counting only the distinct ones).

The product of its digits is 88510464, while the sum is 61.

The spelling of 78273231742447 in words is "seventy-eight trillion, two hundred seventy-three billion, two hundred thirty-one million, seven hundred forty-two thousand, four hundred forty-seven".