126508321601 has 4 divisors (see below), whose sum is σ = 126700292400. Its totient is φ = 126316350804.

The previous prime is 126508321567. The next prime is 126508321603. The reversal of 126508321601 is 106123805621.

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: 106123805621 = 182009 ⋅583069.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-126508321601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (126508321603) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 95984411 + ... + 95985728.

It is an arithmetic number, because the mean of its divisors is an integer number (31675073100).

Almost surely, 2^126508321601 is an apocalyptic number.

It is an amenable number.

126508321601 is a deficient number, since it is larger than the sum of its proper divisors (191970799).

126508321601 is an equidigital number, since it uses as much as digits as its factorization.

126508321601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191970798.

The product of its (nonzero) digits is 17280, while the sum is 35.

The spelling of 126508321601 in words is "one hundred twenty-six billion, five hundred eight million, three hundred twenty-one thousand, six hundred one".