1656260785161 has 16 divisors (see below), whose sum is σ = 2455620368320. Its totient is φ = 1103318547840.

The previous prime is 1656260785159. The next prime is 1656260785183. The reversal of 1656260785161 is 1615870626561.

1656260785161 is a `hidden beast` number, since 1 + 6 + 5 + 62 + 60 + 7 + 8 + 516 + 1 = 666.

It is not a de Polignac number, because 1656260785161 - 2¹ = 1656260785159 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1656260785098 and 1656260785107.

It is not an unprimeable number, because it can be changed into a prime (1656260783161) 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 15 ways as a sum of consecutive naturals, for example, 23723080 + ... + 23792793.

It is an arithmetic number, because the mean of its divisors is an integer number (153476273020).

Almost surely, 2^{1656260785161} is an apocalyptic number.

It is an amenable number.

1656260785161 is a deficient number, since it is larger than the sum of its proper divisors (799359583159).

1656260785161 is a wasteful number, since it uses less digits than its factorization.

1656260785161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47517173 (or 47517167 counting only the distinct ones).

The product of its (nonzero) digits is 3628800, while the sum is 54.

The spelling of 1656260785161 in words is "one trillion, six hundred fifty-six billion, two hundred sixty million, seven hundred eighty-five thousand, one hundred sixty-one".