623927744561 has 12 divisors (see below), whose sum is σ = 726146341956. Its totient is φ = 533841918720.

The previous prime is 623927744537. The next prime is 623927744597. The reversal of 623927744561 is 165447729326.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 562453500961 + 61474243600 = 749969^2 + 247940^2 .

It is a de Polignac number, because none of the positive numbers 2^k-623927744561 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 623927744497 and 623927744506.

It is not an unprimeable number, because it can be changed into a prime (623927744261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 151657580 + ... + 151661693.

It is an arithmetic number, because the mean of its divisors is an integer number (60512195163).

Almost surely, 2^623927744561 is an apocalyptic number.

It is an amenable number.

623927744561 is a deficient number, since it is larger than the sum of its proper divisors (102218597395).

623927744561 is a wasteful number, since it uses less digits than its factorization.

623927744561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 303319312 (or 303319301 counting only the distinct ones).

The product of its digits is 15240960, while the sum is 56.

The spelling of 623927744561 in words is "six hundred twenty-three billion, nine hundred twenty-seven million, seven hundred forty-four thousand, five hundred sixty-one".