621255552126 has 96 divisors (see below), whose sum is σ = 1463633224704. Its totient is φ = 175207032000.

The previous prime is 621255552121. The next prime is 621255552157.

It is a happy number.

621255552126 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×621255552126² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621255552121) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 115051 + ... + 1120601.

It is an arithmetic number, because the mean of its divisors is an integer number (15246179424).

Almost surely, 2^621255552126 is an apocalyptic number.

621255552126 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 621255552126, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (731816612352).

621255552126 is an abundant number, since it is smaller than the sum of its proper divisors (842377672578).

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

621255552126 is a wasteful number, since it uses less digits than its factorization.

621255552126 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1005638 (or 1005627 counting only the distinct ones).

The product of its digits is 360000, while the sum is 42.

The spelling of 621255552126 in words is "six hundred twenty-one billion, two hundred fifty-five million, five hundred fifty-two thousand, one hundred twenty-six".