355056420661 has 4 divisors (see below), whose sum is σ = 356319966924. Its totient is φ = 353792874400.

The previous prime is 355056420601. The next prime is 355056420673. The reversal of 355056420661 is 166024650553.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 313593280036 + 41463140625 = 559994^2 + 203625^2 .

It is a cyclic number.

It is not a de Polignac number, because 355056420661 - 2¹⁹ = 355055896373 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 (355056420601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 631772710 + ... + 631773271.

It is an arithmetic number, because the mean of its divisors is an integer number (89079991731).

Almost surely, 2^355056420661 is an apocalyptic number.

It is an amenable number.

355056420661 is a deficient number, since it is larger than the sum of its proper divisors (1263546263).

355056420661 is a wasteful number, since it uses less digits than its factorization.

355056420661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1263546262.

The product of its (nonzero) digits is 648000, while the sum is 43.

The spelling of 355056420661 in words is "three hundred fifty-five billion, fifty-six million, four hundred twenty thousand, six hundred sixty-one".