621828345869 has 4 divisors (see below), whose sum is σ = 641887324800. Its totient is φ = 601769366940.

The previous prime is 621828345841. The next prime is 621828345877. The reversal of 621828345869 is 968543828126.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 621828345869 - 2¹² = 621828341773 is a prime.

It is a super-2 number, since 2×621828345869² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621828345469) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10029489419 + ... + 10029489480.

It is an arithmetic number, because the mean of its divisors is an integer number (160471831200).

Almost surely, 2^621828345869 is an apocalyptic number.

It is an amenable number.

621828345869 is a deficient number, since it is larger than the sum of its proper divisors (20058978931).

621828345869 is a wasteful number, since it uses less digits than its factorization.

621828345869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20058978930.

The product of its digits is 39813120, while the sum is 62.

The spelling of 621828345869 in words is "six hundred twenty-one billion, eight hundred twenty-eight million, three hundred forty-five thousand, eight hundred sixty-nine".