621648049447 has 2 divisors, whose sum is σ = 621648049448. Its totient is φ = 621648049446.

The previous prime is 621648049439. The next prime is 621648049453. The reversal of 621648049447 is 744940846126.

621648049447 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 not a de Polignac number, because 621648049447 - 2³ = 621648049439 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (621648049417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310824024723 + 310824024724.

It is an arithmetic number, because the mean of its divisors is an integer number (310824024724).

Almost surely, 2^621648049447 is an apocalyptic number.

621648049447 is a deficient number, since it is larger than the sum of its proper divisors (1).

621648049447 is an equidigital number, since it uses as much as digits as its factorization.

621648049447 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9289728, while the sum is 55.

The spelling of 621648049447 in words is "six hundred twenty-one billion, six hundred forty-eight million, forty-nine thousand, four hundred forty-seven".