621256342634 has 8 divisors (see below), whose sum is σ = 944650055460. Its totient is φ = 306372990816.

The previous prime is 621256342583. The next prime is 621256342669. The reversal of 621256342634 is 436243652126.

It can be written as a sum of positive squares in 2 ways, for example, as 518277607225 + 102978735409 = 719915^2 + 320903^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2127590069 + ... + 2127590360.

Almost surely, 2^621256342634 is an apocalyptic number.

621256342634 is a deficient number, since it is larger than the sum of its proper divisors (323393712826).

621256342634 is a wasteful number, since it uses less digits than its factorization.

621256342634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4255180504.

The product of its digits is 1244160, while the sum is 44.

The spelling of 621256342634 in words is "six hundred twenty-one billion, two hundred fifty-six million, three hundred forty-two thousand, six hundred thirty-four".