1781880560181 has 32 divisors (see below), whose sum is σ = 2646184204800. Its totient is φ = 1185060490560.

The previous prime is 1781880560171. The next prime is 1781880560189. The reversal of 1781880560181 is 1810650881871.

1781880560181 is a `hidden beast` number, since 1 + 78 + 1 + 8 + 8 + 0 + 560 + 1 + 8 + 1 = 666.

It is not a de Polignac number, because 1781880560181 - 2²⁶ = 1781813451317 is a prime.

It is a super-2 number, since 2×1781880560181² (a number of 25 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1781880560189) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 25064596 + ... + 25135586.

It is an arithmetic number, because the mean of its divisors is an integer number (82693256400).

Almost surely, 2^{1781880560181} is an apocalyptic number.

It is an amenable number.

1781880560181 is a deficient number, since it is larger than the sum of its proper divisors (864303644619).

1781880560181 is a wasteful number, since it uses less digits than its factorization.

1781880560181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73226 (or 73220 counting only the distinct ones).

The product of its (nonzero) digits is 860160, while the sum is 54.

The spelling of 1781880560181 in words is "one trillion, seven hundred eighty-one billion, eight hundred eighty million, five hundred sixty thousand, one hundred eighty-one".