78427347437431 has 2 divisors, whose sum is σ = 78427347437432. Its totient is φ = 78427347437430.

The previous prime is 78427347437429. The next prime is 78427347437443. The reversal of 78427347437431 is 13473474372487.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78427347437431 - 2¹ = 78427347437429 is a prime.

It is a super-2 number, since 2×78427347437431² (a number of 29 digits) contains 22 as substring.

Together with 78427347437429, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78427347434431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39213673718715 + 39213673718716.

It is an arithmetic number, because the mean of its divisors is an integer number (39213673718716).

Almost surely, 2^{78427347437431} is an apocalyptic number.

78427347437431 is a deficient number, since it is larger than the sum of its proper divisors (1).

78427347437431 is an equidigital number, since it uses as much as digits as its factorization.

78427347437431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 265531392, while the sum is 64.

The spelling of 78427347437431 in words is "seventy-eight trillion, four hundred twenty-seven billion, three hundred forty-seven million, four hundred thirty-seven thousand, four hundred thirty-one".