621266005 has 4 divisors (see below), whose sum is σ = 745519212. Its totient is φ = 497012800.

The previous prime is 621265993. The next prime is 621266011. The reversal of 621266005 is 500662126.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 500662126 = 2 ⋅250331063.

It can be written as a sum of positive squares in 2 ways, for example, as 234671761 + 386594244 = 15319^2 + 19662^2 .

It is not a de Polignac number, because 621266005 - 2⁷ = 621265877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62126596 + ... + 62126605.

It is an arithmetic number, because the mean of its divisors is an integer number (186379803).

Almost surely, 2^621266005 is an apocalyptic number.

It is an amenable number.

621266005 is a deficient number, since it is larger than the sum of its proper divisors (124253207).

621266005 is a wasteful number, since it uses less digits than its factorization.

621266005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124253206.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 621266005 is about 24925.2082238043. The cubic root of 621266005 is about 853.2818934480.

The spelling of 621266005 in words is "six hundred twenty-one million, two hundred sixty-six thousand, five".