1261038042171 has 160 divisors (see below), whose sum is σ = 2086841465280. Its totient is φ = 755575382016.

The previous prime is 1261038042169. The next prime is 1261038042193. The reversal of 1261038042171 is 1712408301621.

1261038042171 is a `hidden beast` number, since 1 + 2 + 61 + 0 + 380 + 4 + 217 + 1 = 666.

It is not a de Polignac number, because 1261038042171 - 2¹ = 1261038042169 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1261038042371) by changing a digit.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 1220752671 + ... + 1220753703.

It is an arithmetic number, because the mean of its divisors is an integer number (13042759158).

Almost surely, 2^{1261038042171} is an apocalyptic number.

1261038042171 is a deficient number, since it is larger than the sum of its proper divisors (825803423109).

1261038042171 is a wasteful number, since it uses less digits than its factorization.

1261038042171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1547 (or 1538 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The spelling of 1261038042171 in words is "one trillion, two hundred sixty-one billion, thirty-eight million, forty-two thousand, one hundred seventy-one".