126691378933 has 4 divisors (see below), whose sum is σ = 144790147360. Its totient is φ = 108592610508.

The previous prime is 126691378927. The next prime is 126691378963. The reversal of 126691378933 is 339873196621.

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: 339873196621 = 7 ⋅48553313803.

It is a cyclic number.

It is not a de Polignac number, because 126691378933 - 2¹⁷ = 126691247861 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126691378963) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9049384203 + ... + 9049384216.

It is an arithmetic number, because the mean of its divisors is an integer number (36197536840).

Almost surely, 2^126691378933 is an apocalyptic number.

It is an amenable number.

126691378933 is a deficient number, since it is larger than the sum of its proper divisors (18098768427).

126691378933 is an equidigital number, since it uses as much as digits as its factorization.

126691378933 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18098768426.

The product of its digits is 8817984, while the sum is 58.

The spelling of 126691378933 in words is "one hundred twenty-six billion, six hundred ninety-one million, three hundred seventy-eight thousand, nine hundred thirty-three".