126621660323 has 2 divisors, whose sum is σ = 126621660324. Its totient is φ = 126621660322.

The previous prime is 126621660301. The next prime is 126621660367. The reversal of 126621660323 is 323066126621.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 126621660323 - 2¹⁰ = 126621659299 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (126621660023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63310830161 + 63310830162.

It is an arithmetic number, because the mean of its divisors is an integer number (63310830162).

Almost surely, 2^126621660323 is an apocalyptic number.

126621660323 is a deficient number, since it is larger than the sum of its proper divisors (1).

126621660323 is an equidigital number, since it uses as much as digits as its factorization.

126621660323 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 93312, while the sum is 38.

Adding to 126621660323 its reverse (323066126621), we get a palindrome (449687786944).

The spelling of 126621660323 in words is "one hundred twenty-six billion, six hundred twenty-one million, six hundred sixty thousand, three hundred twenty-three".