621747747126 has 64 divisors (see below), whose sum is σ = 1507752264960. Its totient is φ = 188347783680.

The previous prime is 621747747083. The next prime is 621747747143.

It is a happy number.

621747747126 is a `hidden beast` number, since 6 + 2 + 1 + 7 + 477 + 47 + 126 = 666.

621747747126 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×621747747126² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1696545 + ... + 2030211.

It is an arithmetic number, because the mean of its divisors is an integer number (23558629140).

Almost surely, 2^621747747126 is an apocalyptic number.

621747747126 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

621747747126 is an abundant number, since it is smaller than the sum of its proper divisors (886004517834).

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

621747747126 is a wasteful number, since it uses less digits than its factorization.

621747747126 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336826 (or 336820 counting only the distinct ones).

The product of its digits is 5531904, while the sum is 54.

It can be divided in two parts, 621 and 747747126, that added together give a palindrome (747747747).

The spelling of 621747747126 in words is "six hundred twenty-one billion, seven hundred forty-seven million, seven hundred forty-seven thousand, one hundred twenty-six".