2208725561781 has 12 divisors (see below), whose sum is σ = 3192295234752. Its totient is φ = 1471600384296.

The previous prime is 2208725561753. The next prime is 2208725561797. The reversal of 2208725561781 is 1871655278022.

It is a happy number.

2208725561781 is a `hidden beast` number, since 2 + 2 + 0 + 8 + 7 + 2 + 5 + 561 + 78 + 1 = 666.

It is not a de Polignac number, because 2208725561781 - 2²² = 2208721367477 is a prime.

It is a super-2 number, since 2×2208725561781² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2208725561741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 73594461 + ... + 73624466.

It is an arithmetic number, because the mean of its divisors is an integer number (266024602896).

Almost surely, 2^{2208725561781} is an apocalyptic number.

It is an amenable number.

2208725561781 is a deficient number, since it is larger than the sum of its proper divisors (983569672971).

2208725561781 is a wasteful number, since it uses less digits than its factorization.

2208725561781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147220600 (or 147220597 counting only the distinct ones).

The product of its (nonzero) digits is 3763200, while the sum is 54.

The spelling of 2208725561781 in words is "two trillion, two hundred eight billion, seven hundred twenty-five million, five hundred sixty-one thousand, seven hundred eighty-one".