2178250503561 has 12 divisors (see below), whose sum is σ = 3432394733040. Its totient is φ = 1320151820280.

The previous prime is 2178250503439. The next prime is 2178250503581. The reversal of 2178250503561 is 1653050528712.

2178250503561 is a `hidden beast` number, since 2 + 1 + 7 + 82 + 5 + 0 + 5 + 0 + 3 + 561 = 666.

It is not a de Polignac number, because 2178250503561 - 2²⁷ = 2178116285833 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2178250503581) 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, 11001265071 + ... + 11001265268.

It is an arithmetic number, because the mean of its divisors is an integer number (286032894420).

Almost surely, 2^{2178250503561} is an apocalyptic number.

It is an amenable number.

2178250503561 is a deficient number, since it is larger than the sum of its proper divisors (1254144229479).

2178250503561 is a wasteful number, since it uses less digits than its factorization.

2178250503561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22002530356 (or 22002530353 counting only the distinct ones).

The product of its (nonzero) digits is 504000, while the sum is 45.

The spelling of 2178250503561 in words is "two trillion, one hundred seventy-eight billion, two hundred fifty million, five hundred three thousand, five hundred sixty-one".