661326363001 has 2 divisors, whose sum is σ = 661326363002. Its totient is φ = 661326363000.

The previous prime is 661326362999. The next prime is 661326363037. The reversal of 661326363001 is 100363623166.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 618659329401 + 42667033600 = 786549^2 + 206560^2 .

It is a cyclic number.

It is not a de Polignac number, because 661326363001 - 2¹ = 661326362999 is a prime.

It is a super-4 number, since 4×661326363001⁴ (a number of 48 digits) contains 4444 as substring.

Together with 661326362999, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (661326363301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330663181500 + 330663181501.

It is an arithmetic number, because the mean of its divisors is an integer number (330663181501).

Almost surely, 2^661326363001 is an apocalyptic number.

It is an amenable number.

661326363001 is a deficient number, since it is larger than the sum of its proper divisors (1).

661326363001 is an equidigital number, since it uses as much as digits as its factorization.

661326363001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 69984, while the sum is 37.

Adding to 661326363001 its reverse (100363623166), we get a palindrome (761689986167).

The spelling of 661326363001 in words is "six hundred sixty-one billion, three hundred twenty-six million, three hundred sixty-three thousand, one".