1261038042172 has 24 divisors (see below), whose sum is σ = 2337134760576. Its totient is φ = 594103578288.

The previous prime is 1261038042169. The next prime is 1261038042193. The reversal of 1261038042172 is 2712408301621.

It is a super-3 number, since 3×1261038042172³ (a number of 37 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 102284398 + ... + 102296725.

It is an arithmetic number, because the mean of its divisors is an integer number (97380615024).

Almost surely, 2^{1261038042172} is an apocalyptic number.

It is an amenable number.

1261038042172 is a deficient number, since it is larger than the sum of its proper divisors (1076096718404).

1261038042172 is a wasteful number, since it uses less digits than its factorization.

1261038042172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204581217 (or 204581215 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 37.

The spelling of 1261038042172 in words is "one trillion, two hundred sixty-one billion, thirty-eight million, forty-two thousand, one hundred seventy-two".