621858068639 has 4 divisors (see below), whose sum is σ = 635089091424. Its totient is φ = 608627045856.

The previous prime is 621858068593. The next prime is 621858068641. The reversal of 621858068639 is 936860858126.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 621858068639 - 2¹⁶ = 621858003103 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621858068939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6615511322 + ... + 6615511415.

It is an arithmetic number, because the mean of its divisors is an integer number (158772272856).

Almost surely, 2^621858068639 is an apocalyptic number.

621858068639 is a deficient number, since it is larger than the sum of its proper divisors (13231022785).

621858068639 is a wasteful number, since it uses less digits than its factorization.

621858068639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13231022784.

The product of its (nonzero) digits is 29859840, while the sum is 62.

The spelling of 621858068639 in words is "six hundred twenty-one billion, eight hundred fifty-eight million, sixty-eight thousand, six hundred thirty-nine".