126644563440561 has 16 divisors (see below), whose sum is σ = 168923417898816. Its totient is φ = 84397714691136.

The previous prime is 126644563440539. The next prime is 126644563440569. The reversal of 126644563440561 is 165044365446621.

It is not a de Polignac number, because 126644563440561 - 2⁹ = 126644563440049 is a prime.

It is a super-3 number, since 3×126644563440561³ (a number of 43 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (126644563440569) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 88559131 + ... + 89977823.

It is an arithmetic number, because the mean of its divisors is an integer number (10557713618676).

Almost surely, 2^{126644563440561} is an apocalyptic number.

It is an amenable number.

126644563440561 is a deficient number, since it is larger than the sum of its proper divisors (42278854458255).

126644563440561 is a wasteful number, since it uses less digits than its factorization.

126644563440561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1429952.

The product of its (nonzero) digits is 49766400, while the sum is 57.

The spelling of 126644563440561 in words is "one hundred twenty-six trillion, six hundred forty-four billion, five hundred sixty-three million, four hundred forty thousand, five hundred sixty-one".