623421537647 has 2 divisors, whose sum is σ = 623421537648. Its totient is φ = 623421537646.

The previous prime is 623421537631. The next prime is 623421537653. The reversal of 623421537647 is 746735124326.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 623421537647 - 2⁴ = 623421537631 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 623421537595 and 623421537604.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (623421539647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 311710768823 + 311710768824.

It is an arithmetic number, because the mean of its divisors is an integer number (311710768824).

Almost surely, 2^623421537647 is an apocalyptic number.

623421537647 is a deficient number, since it is larger than the sum of its proper divisors (1).

623421537647 is an equidigital number, since it uses as much as digits as its factorization.

623421537647 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5080320, while the sum is 50.

The spelling of 623421537647 in words is "six hundred twenty-three billion, four hundred twenty-one million, five hundred thirty-seven thousand, six hundred forty-seven".