647874920443 has 2 divisors, whose sum is σ = 647874920444. Its totient is φ = 647874920442.

The previous prime is 647874920401. The next prime is 647874920447. The reversal of 647874920443 is 344029478746.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 647874920443 - 2²⁹ = 647338049531 is a prime.

It is not a weakly prime, because it can be changed into another prime (647874920447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323937460221 + 323937460222.

It is an arithmetic number, because the mean of its divisors is an integer number (323937460222).

Almost surely, 2^647874920443 is an apocalyptic number.

647874920443 is a deficient number, since it is larger than the sum of its proper divisors (1).

647874920443 is an equidigital number, since it uses as much as digits as its factorization.

647874920443 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32514048, while the sum is 58.

The spelling of 647874920443 in words is "six hundred forty-seven billion, eight hundred seventy-four million, nine hundred twenty thousand, four hundred forty-three".