1261089666203 has 12 divisors (see below), whose sum is σ = 1307327119560. Its totient is φ = 1216433795040.

The previous prime is 1261089666191. The next prime is 1261089666271. The reversal of 1261089666203 is 3026669801621.

It is a de Polignac number, because none of the positive numbers 2^k-1261089666203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1261089666103) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1842218 + ... + 2432271.

It is an arithmetic number, because the mean of its divisors is an integer number (108943926630).

Almost surely, 2^{1261089666203} is an apocalyptic number.

1261089666203 is a deficient number, since it is larger than the sum of its proper divisors (46237453357).

1261089666203 is an equidigital number, since it uses as much as digits as its factorization.

1261089666203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4274858 (or 4274827 counting only the distinct ones).

The product of its (nonzero) digits is 1119744, while the sum is 50.

The spelling of 1261089666203 in words is "one trillion, two hundred sixty-one billion, eighty-nine million, six hundred sixty-six thousand, two hundred three".