78414749447 has 2 divisors, whose sum is σ = 78414749448. Its totient is φ = 78414749446.

The previous prime is 78414749429. The next prime is 78414749513. The reversal of 78414749447 is 74494741487.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78414749447 - 2⁸ = 78414749191 is a prime.

It is a super-2 number, since 2×78414749447² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78414749407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39207374723 + 39207374724.

It is an arithmetic number, because the mean of its divisors is an integer number (39207374724).

Almost surely, 2^78414749447 is an apocalyptic number.

78414749447 is a deficient number, since it is larger than the sum of its proper divisors (1).

78414749447 is an equidigital number, since it uses as much as digits as its factorization.

78414749447 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25288704, while the sum is 59.

The spelling of 78414749447 in words is "seventy-eight billion, four hundred fourteen million, seven hundred forty-nine thousand, four hundred forty-seven".