126878732457 has 4 divisors (see below), whose sum is σ = 169171643280. Its totient is φ = 84585821636.

The previous prime is 126878732443. The next prime is 126878732473. The reversal of 126878732457 is 754237878621.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 754237878621 = 3 ⋅251412626207.

It is a cyclic number.

It is not a de Polignac number, because 126878732457 - 2¹¹ = 126878730409 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 126878732457.

It is not an unprimeable number, because it can be changed into a prime (126878732857) 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 in 3 ways as a sum of consecutive naturals, for example, 21146455407 + ... + 21146455412.

It is an arithmetic number, because the mean of its divisors is an integer number (42292910820).

Almost surely, 2^126878732457 is an apocalyptic number.

It is an amenable number.

126878732457 is a deficient number, since it is larger than the sum of its proper divisors (42292910823).

126878732457 is an equidigital number, since it uses as much as digits as its factorization.

126878732457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42292910822.

The product of its digits is 31610880, while the sum is 60.

The spelling of 126878732457 in words is "one hundred twenty-six billion, eight hundred seventy-eight million, seven hundred thirty-two thousand, four hundred fifty-seven".