12928780457 has 2 divisors, whose sum is σ = 12928780458. Its totient is φ = 12928780456.

The previous prime is 12928780391. The next prime is 12928780499. The reversal of 12928780457 is 75408782921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8415493696 + 4513286761 = 91736^2 + 67181^2 .

It is an emirp because it is prime and its reverse (75408782921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12928780457 - 2¹⁸ = 12928518313 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12928780399 and 12928780408.

It is not a weakly prime, because it can be changed into another prime (12928780057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6464390228 + 6464390229.

It is an arithmetic number, because the mean of its divisors is an integer number (6464390229).

Almost surely, 2^12928780457 is an apocalyptic number.

It is an amenable number.

12928780457 is a deficient number, since it is larger than the sum of its proper divisors (1).

12928780457 is an equidigital number, since it uses as much as digits as its factorization.

12928780457 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2257920, while the sum is 53.

The spelling of 12928780457 in words is "twelve billion, nine hundred twenty-eight million, seven hundred eighty thousand, four hundred fifty-seven".