451621223523661 has 8 divisors (see below), whose sum is σ = 463868627202200. Its totient is φ = 439376000090688.

The previous prime is 451621223523637. The next prime is 451621223523671. The reversal of 451621223523661 is 166325322126154.

It can be written as a sum of positive squares in 4 ways, for example, as 130538188459561 + 321083035064100 = 11425331^2 + 17918790^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 451621223523661 - 2²¹ = 451621221426509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (451621223523611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 544641486 + ... + 545470063.

It is an arithmetic number, because the mean of its divisors is an integer number (57983578400275).

Almost surely, 2^{451621223523661} is an apocalyptic number.

It is an amenable number.

451621223523661 is a deficient number, since it is larger than the sum of its proper divisors (12247403678539).

451621223523661 is a wasteful number, since it uses less digits than its factorization.

451621223523661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1090122783.

The product of its digits is 3110400, while the sum is 49.

The spelling of 451621223523661 in words is "four hundred fifty-one trillion, six hundred twenty-one billion, two hundred twenty-three million, five hundred twenty-three thousand, six hundred sixty-one".