621984489126 has 128 divisors (see below), whose sum is σ = 1715365886976. Its totient is φ = 145096634880.

The previous prime is 621984489121. The next prime is 621984489131.

It is a happy number.

621984489126 is nontrivially palindromic in base 10.

It is an interprime number because it is at equal distance from previous prime (621984489121) and next prime (621984489131).

It is a self number, because there is not a number n which added to its sum of digits gives 621984489126.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621984489121) 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 63 ways as a sum of consecutive naturals, for example, 1177245 + ... + 1621688.

It is an arithmetic number, because the mean of its divisors is an integer number (13401295992).

Almost surely, 2^621984489126 is an apocalyptic number.

621984489126 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

621984489126 is an abundant number, since it is smaller than the sum of its proper divisors (1093381397850).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

621984489126 is a wasteful number, since it uses less digits than its factorization.

621984489126 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2799006.

The product of its digits is 11943936, while the sum is 60.

The spelling of 621984489126 in words is "six hundred twenty-one billion, nine hundred eighty-four million, four hundred eighty-nine thousand, one hundred twenty-six".