1261038042173 has 16 divisors (see below), whose sum is σ = 1555841602560. Its totient is φ = 995304882816.

The previous prime is 1261038042169. The next prime is 1261038042193. The reversal of 1261038042173 is 3712408301621.

It is a cyclic number.

It is not a de Polignac number, because 1261038042173 - 2² = 1261038042169 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261038042133) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16903565 + ... + 16978002.

It is an arithmetic number, because the mean of its divisors is an integer number (97240100160).

Almost surely, 2^{1261038042173} is an apocalyptic number.

1261038042173 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1261038042173 is a deficient number, since it is larger than the sum of its proper divisors (294803560387).

1261038042173 is a wasteful number, since it uses less digits than its factorization.

1261038042173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33881996.

The product of its (nonzero) digits is 48384, while the sum is 38.

The spelling of 1261038042173 in words is "one trillion, two hundred sixty-one billion, thirty-eight million, forty-two thousand, one hundred seventy-three".