621663533983 has 2 divisors, whose sum is σ = 621663533984. Its totient is φ = 621663533982.

The previous prime is 621663533977. The next prime is 621663533987. The reversal of 621663533983 is 389335366126.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 621663533983 - 2⁹ = 621663533471 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (621663533987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310831766991 + 310831766992.

It is an arithmetic number, because the mean of its divisors is an integer number (310831766992).

Almost surely, 2^621663533983 is an apocalyptic number.

621663533983 is a deficient number, since it is larger than the sum of its proper divisors (1).

621663533983 is an equidigital number, since it uses as much as digits as its factorization.

621663533983 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12597120, while the sum is 55.

The spelling of 621663533983 in words is "six hundred twenty-one billion, six hundred sixty-three million, five hundred thirty-three thousand, nine hundred eighty-three".