126691378929 has 24 divisors (see below), whose sum is σ = 191747542272. Its totient is φ = 80453450880.

The previous prime is 126691378927. The next prime is 126691378963. The reversal of 126691378929 is 929873196621.

It is not a de Polignac number, because 126691378929 - 2¹ = 126691378927 is a prime.

It is not an unprimeable number, because it can be changed into a prime (126691378921) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1219897 + ... + 1319670.

It is an arithmetic number, because the mean of its divisors is an integer number (7989480928).

Almost surely, 2^126691378929 is an apocalyptic number.

It is an amenable number.

126691378929 is a deficient number, since it is larger than the sum of its proper divisors (65056163343).

126691378929 is a wasteful number, since it uses less digits than its factorization.

126691378929 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2539837 (or 2539834 counting only the distinct ones).

The product of its digits is 17635968, while the sum is 63.

The spelling of 126691378929 in words is "one hundred twenty-six billion, six hundred ninety-one million, three hundred seventy-eight thousand, nine hundred twenty-nine".