126669706591 has 8 divisors (see below), whose sum is σ = 127684922400. Its totient is φ = 125656692192.

The previous prime is 126669706487. The next prime is 126669706601. The reversal of 126669706591 is 195607966621.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 126669706591 - 2³¹ = 124522222943 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 (126669706091) 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 7 ways as a sum of consecutive naturals, for example, 434715 + ... + 665068.

It is an arithmetic number, because the mean of its divisors is an integer number (15960615300).

Almost surely, 2^126669706591 is an apocalyptic number.

126669706591 is a deficient number, since it is larger than the sum of its proper divisors (1015215809).

126669706591 is a wasteful number, since it uses less digits than its factorization.

126669706591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1100705.

The product of its (nonzero) digits is 7348320, while the sum is 58.

The spelling of 126669706591 in words is "one hundred twenty-six billion, six hundred sixty-nine million, seven hundred six thousand, five hundred ninety-one".