126386865778 has 4 divisors (see below), whose sum is σ = 189580298670. Its totient is φ = 63193432888.

The previous prime is 126386865767. The next prime is 126386865793. The reversal of 126386865778 is 877568683621.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 100789105729 + 25597760049 = 317473^2 + 159993^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31596716443 + ... + 31596716446.

Almost surely, 2^126386865778 is an apocalyptic number.

126386865778 is a deficient number, since it is larger than the sum of its proper divisors (63193432892).

126386865778 is an equidigital number, since it uses as much as digits as its factorization.

126386865778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63193432891.

The product of its digits is 162570240, while the sum is 67.

The spelling of 126386865778 in words is "one hundred twenty-six billion, three hundred eighty-six million, eight hundred sixty-five thousand, seven hundred seventy-eight".