1621366664341 has 4 divisors (see below), whose sum is σ = 1625128536384. Its totient is φ = 1617604792300.

The previous prime is 1621366664303. The next prime is 1621366664369. The reversal of 1621366664341 is 1434666631261.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1621366664341 - 2¹³ = 1621366656149 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1621366664741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1880935375 + ... + 1880936236.

It is an arithmetic number, because the mean of its divisors is an integer number (406282134096).

Almost surely, 2^{1621366664341} is an apocalyptic number.

It is an amenable number.

1621366664341 is a deficient number, since it is larger than the sum of its proper divisors (3761872043).

1621366664341 is an equidigital number, since it uses as much as digits as its factorization.

1621366664341 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3761872042.

The product of its digits is 2239488, while the sum is 49.

The spelling of 1621366664341 in words is "one trillion, six hundred twenty-one billion, three hundred sixty-six million, six hundred sixty-four thousand, three hundred forty-one".