126730634561 has 4 divisors (see below), whose sum is σ = 126741810624. Its totient is φ = 126719458500.

The previous prime is 126730634551. The next prime is 126730634609. The reversal of 126730634561 is 165436037621.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-126730634561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (126730634521) 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, 5571005 + ... + 5593706.

It is an arithmetic number, because the mean of its divisors is an integer number (31685452656).

Almost surely, 2^126730634561 is an apocalyptic number.

It is an amenable number.

126730634561 is a deficient number, since it is larger than the sum of its proper divisors (11176063).

126730634561 is a wasteful number, since it uses less digits than its factorization.

126730634561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11176062.

The product of its (nonzero) digits is 544320, while the sum is 44.

The spelling of 126730634561 in words is "one hundred twenty-six billion, seven hundred thirty million, six hundred thirty-four thousand, five hundred sixty-one".