236965477681 has 9 divisors (see below), whose sum is σ = 238908368811. Its totient is φ = 235038272112.

The previous prime is 236965477589. The next prime is 236965477687. The reversal of 236965477681 is 186774569632.

The square root of 236965477681 is 486791.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 51390623025 + 185574854656 = 226695^2 + 430784^2 .

It is not a de Polignac number, because 236965477681 - 2⁹ = 236965477169 is a prime.

It is a super-2 number, since 2×236965477681² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (236965477687) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 61820541 + ... + 61824373.

Almost surely, 2^236965477681 is an apocalyptic number.

236965477681 is the 486791-st square number.

236965477681 is the 243396-th centered octagonal number.

It is an amenable number.

236965477681 is a deficient number, since it is larger than the sum of its proper divisors (1942891130).

236965477681 is an frugal number, since it uses more digits than its factorization.

236965477681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7920 (or 3960 counting only the distinct ones).

The product of its digits is 91445760, while the sum is 64.

Multiplying 236965477681 by its sum of digits (64), we get a square (15165790571584 = 3894328²).

The spelling of 236965477681 in words is "two hundred thirty-six billion, nine hundred sixty-five million, four hundred seventy-seven thousand, six hundred eighty-one".