238906865961 has 63 divisors (see below), whose sum is σ = 367593452487. Its totient is φ = 155197743120.

The previous prime is 238906865959. The next prime is 238906866017. The reversal of 238906865961 is 169568609832.

The square root of 238906865961 is 488781.

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

238906865961 is a `hidden beast` number, since 2 + 38 + 9 + 0 + 6 + 8 + 6 + 596 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1133601561 + 237773264400 = 33669^2 + 487620^2 .

It is not a de Polignac number, because 238906865961 - 2¹ = 238906865959 is a prime.

It is not an unprimeable number, because it can be changed into a prime (238906864961) by changing a digit.

It is a polite number, since it can be written in 62 ways as a sum of consecutive naturals, for example, 567474531 + ... + 567474951.

Almost surely, 2^238906865961 is an apocalyptic number.

238906865961 is the 488781-st square number.

238906865961 is the 244391-st centered octagonal number.

It is an amenable number.

238906865961 is a deficient number, since it is larger than the sum of its proper divisors (128686586526).

238906865961 is an frugal number, since it uses more digits than its factorization.

238906865961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 946 (or 467 counting only the distinct ones).

The product of its (nonzero) digits is 33592320, while the sum is 63.

The spelling of 238906865961 in words is "two hundred thirty-eight billion, nine hundred six million, eight hundred sixty-five thousand, nine hundred sixty-one".