621243442525 has 6 divisors (see below), whose sum is σ = 770341868762. Its totient is φ = 496994754000.

The previous prime is 621243442471. The next prime is 621243442531. The reversal of 621243442525 is 525244342126.

It can be written as a sum of positive squares in 3 ways, for example, as 199468531161 + 421774911364 = 446619^2 + 649442^2 .

It is not a de Polignac number, because 621243442525 - 2¹⁹ = 621242918237 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12424868826 + ... + 12424868875.

Almost surely, 2^621243442525 is an apocalyptic number.

It is an amenable number.

621243442525 is a deficient number, since it is larger than the sum of its proper divisors (149098426237).

621243442525 is a wasteful number, since it uses less digits than its factorization.

621243442525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24849737711 (or 24849737706 counting only the distinct ones).

The product of its digits is 460800, while the sum is 40.

The spelling of 621243442525 in words is "six hundred twenty-one billion, two hundred forty-three million, four hundred forty-two thousand, five hundred twenty-five".