1656115221325 has 12 divisors (see below), whose sum is σ = 2124396077940. Its totient is φ = 1279206239360.

The previous prime is 1656115221269. The next prime is 1656115221347. The reversal of 1656115221325 is 5231225116561.

It can be written as a sum of positive squares in 6 ways, for example, as 374469339721 + 1281645881604 = 611939^2 + 1132098^2 .

It is not a de Polignac number, because 1656115221325 - 2¹¹ = 1656115219277 is a prime.

It is a congruent number.

It is an unprimeable number.

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, 1142147704 + ... + 1142149153.

It is an arithmetic number, because the mean of its divisors is an integer number (177033006495).

Almost surely, 2^{1656115221325} is an apocalyptic number.

It is an amenable number.

1656115221325 is a deficient number, since it is larger than the sum of its proper divisors (468280856615).

1656115221325 is a wasteful number, since it uses less digits than its factorization.

1656115221325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2284296896 (or 2284296891 counting only the distinct ones).

The product of its digits is 108000, while the sum is 40.

The spelling of 1656115221325 in words is "one trillion, six hundred fifty-six billion, one hundred fifteen million, two hundred twenty-one thousand, three hundred twenty-five".