78477477479 has 2 divisors, whose sum is σ = 78477477480. Its totient is φ = 78477477478.

The previous prime is 78477477467. The next prime is 78477477493. The reversal of 78477477479 is 97477477487.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78477477479 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78477477409) 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 as a sum of consecutive naturals, namely, 39238738739 + 39238738740.

It is an arithmetic number, because the mean of its divisors is an integer number (39238738740).

Almost surely, 2^78477477479 is an apocalyptic number.

78477477479 is a deficient number, since it is larger than the sum of its proper divisors (1).

78477477479 is an equidigital number, since it uses as much as digits as its factorization.

78477477479 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 542126592, while the sum is 71.

The spelling of 78477477479 in words is "seventy-eight billion, four hundred seventy-seven million, four hundred seventy-seven thousand, four hundred seventy-nine".