661443015222433 has 2 divisors, whose sum is σ = 661443015222434. Its totient is φ = 661443015222432.

The previous prime is 661443015222419. The next prime is 661443015222469. The reversal of 661443015222433 is 334222510344166.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 610809871426624 + 50633143795809 = 24714568^2 + 7115697^2 .

It is a cyclic number.

It is not a de Polignac number, because 661443015222433 - 2⁴⁵ = 626258643133601 is a prime.

It is not a weakly prime, because it can be changed into another prime (661443015222403) 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 as a sum of consecutive naturals, namely, 330721507611216 + 330721507611217.

It is an arithmetic number, because the mean of its divisors is an integer number (330721507611217).

Almost surely, 2^{661443015222433} is an apocalyptic number.

It is an amenable number.

661443015222433 is a deficient number, since it is larger than the sum of its proper divisors (1).

661443015222433 is an equidigital number, since it uses as much as digits as its factorization.

661443015222433 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2488320, while the sum is 46.

Adding to 661443015222433 its reverse (334222510344166), we get a palindrome (995665525566599).

The spelling of 661443015222433 in words is "six hundred sixty-one trillion, four hundred forty-three billion, fifteen million, two hundred twenty-two thousand, four hundred thirty-three".