1261500116003 has 2 divisors, whose sum is σ = 1261500116004. Its totient is φ = 1261500116002.

The previous prime is 1261500115991. The next prime is 1261500116027. The reversal of 1261500116003 is 3006110051621.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1261500116003 - 2²⁰ = 1261499067427 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (1261500916003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 630750058001 + 630750058002.

It is an arithmetic number, because the mean of its divisors is an integer number (630750058002).

Almost surely, 2^{1261500116003} is an apocalyptic number.

1261500116003 is a deficient number, since it is larger than the sum of its proper divisors (1).

1261500116003 is an equidigital number, since it uses as much as digits as its factorization.

1261500116003 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1080, while the sum is 26.

Adding to 1261500116003 its reverse (3006110051621), we get a palindrome (4267610167624).

The spelling of 1261500116003 in words is "one trillion, two hundred sixty-one billion, five hundred million, one hundred sixteen thousand, three".