623421537559 has 2 divisors, whose sum is σ = 623421537560. Its totient is φ = 623421537558.

The previous prime is 623421537509. The next prime is 623421537569. The reversal of 623421537559 is 955735124326.

623421537559 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-623421537559 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (623421537509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 311710768779 + 311710768780.

It is an arithmetic number, because the mean of its divisors is an integer number (311710768780).

Almost surely, 2^623421537559 is an apocalyptic number.

623421537559 is a deficient number, since it is larger than the sum of its proper divisors (1).

623421537559 is an equidigital number, since it uses as much as digits as its factorization.

623421537559 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6804000, while the sum is 52.

The spelling of 623421537559 in words is "six hundred twenty-three billion, four hundred twenty-one million, five hundred thirty-seven thousand, five hundred fifty-nine".