621666131220603 has 32 divisors (see below), whose sum is σ = 1052775742464000. Its totient is φ = 355163765456448.

The previous prime is 621666131220599. The next prime is 621666131220643. The reversal of 621666131220603 is 306022131666126.

It is not a de Polignac number, because 621666131220603 - 2² = 621666131220599 is a prime.

It is not an unprimeable number, because it can be changed into a prime (621666131220643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 341793426 + ... + 343607447.

It is an arithmetic number, because the mean of its divisors is an integer number (32899241952000).

Almost surely, 2^{621666131220603} is an apocalyptic number.

621666131220603 is a gapful number since it is divisible by the number (63) formed by its first and last digit.

621666131220603 is a deficient number, since it is larger than the sum of its proper divisors (431109611243397).

621666131220603 is a wasteful number, since it uses less digits than its factorization.

621666131220603 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 685405688 (or 685405682 counting only the distinct ones).

The product of its (nonzero) digits is 559872, while the sum is 45.

Adding to 621666131220603 its reverse (306022131666126), we get a palindrome (927688262886729).

The spelling of 621666131220603 in words is "six hundred twenty-one trillion, six hundred sixty-six billion, one hundred thirty-one million, two hundred twenty thousand, six hundred three".