12251041661 has 2 divisors, whose sum is σ = 12251041662. Its totient is φ = 12251041660.

The previous prime is 12251041651. The next prime is 12251041709. The reversal of 12251041661 is 16614015221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10446066436 + 1804975225 = 102206^2 + 42485^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12251041661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12251041651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6125520830 + 6125520831.

It is an arithmetic number, because the mean of its divisors is an integer number (6125520831).

Almost surely, 2^12251041661 is an apocalyptic number.

It is an amenable number.

12251041661 is a deficient number, since it is larger than the sum of its proper divisors (1).

12251041661 is an equidigital number, since it uses as much as digits as its factorization.

12251041661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2880, while the sum is 29.

Adding to 12251041661 its reverse (16614015221), we get a palindrome (28865056882).

The spelling of 12251041661 in words is "twelve billion, two hundred fifty-one million, forty-one thousand, six hundred sixty-one".