238355236665 has 72 divisors (see below), whose sum is σ = 517571433288. Its totient is φ = 100580659200.

The previous prime is 238355236661. The next prime is 238355236687. The reversal of 238355236665 is 566632553832.

It can be written as a sum of positive squares in 4 ways, for example, as 1134611856 + 237220624809 = 33684^2 + 487053^2 .

It is not a de Polignac number, because 238355236665 - 2² = 238355236661 is a prime.

It is not an unprimeable number, because it can be changed into a prime (238355236661) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 4128936 + ... + 4186265.

It is an arithmetic number, because the mean of its divisors is an integer number (7188492129).

Almost surely, 2^238355236665 is an apocalyptic number.

It is an amenable number.

238355236665 is an abundant number, since it is smaller than the sum of its proper divisors (279216196623).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

238355236665 is a wasteful number, since it uses less digits than its factorization.

238355236665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8315239 (or 8315229 counting only the distinct ones).

The product of its digits is 23328000, while the sum is 54.

The spelling of 238355236665 in words is "two hundred thirty-eight billion, three hundred fifty-five million, two hundred thirty-six thousand, six hundred sixty-five".