621439308663 has 16 divisors (see below), whose sum is σ = 836335052256. Its totient is φ = 410436034560.

The previous prime is 621439308661. The next prime is 621439308689. The reversal of 621439308663 is 366803934126.

It is a happy number.

621439308663 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 621439308663 - 2¹ = 621439308661 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621439308661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2087220 + ... + 2366297.

It is an arithmetic number, because the mean of its divisors is an integer number (52270940766).

Almost surely, 2^621439308663 is an apocalyptic number.

621439308663 is a deficient number, since it is larger than the sum of its proper divisors (214895743593).

621439308663 is a wasteful number, since it uses less digits than its factorization.

621439308663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4453954.

The product of its (nonzero) digits is 3359232, while the sum is 51.

The spelling of 621439308663 in words is "six hundred twenty-one billion, four hundred thirty-nine million, three hundred eight thousand, six hundred sixty-three".