188897949565 has 32 divisors (see below), whose sum is σ = 244769545440. Its totient is φ = 139119983616.

The previous prime is 188897949563. The next prime is 188897949587. The reversal of 188897949565 is 565949798881.

It can be written as a sum of positive squares in 16 ways, for example, as 123711179076 + 65186770489 = 351726^2 + 255317^2 .

It is a cyclic number.

It is not a de Polignac number, because 188897949565 - 2¹ = 188897949563 is a prime.

It is a super-2 number, since 2×188897949565² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (188897949563) 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, 47069499 + ... + 47073511.

It is an arithmetic number, because the mean of its divisors is an integer number (7649048295).

Almost surely, 2^188897949565 is an apocalyptic number.

It is an amenable number.

188897949565 is a deficient number, since it is larger than the sum of its proper divisors (55871595875).

188897949565 is a wasteful number, since it uses less digits than its factorization.

188897949565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5793.

The product of its digits is 1567641600, while the sum is 79.

The spelling of 188897949565 in words is "one hundred eighty-eight billion, eight hundred ninety-seven million, nine hundred forty-nine thousand, five hundred sixty-five".