238825395991 has 32 divisors (see below), whose sum is σ = 303587948160. Its totient is φ = 182855522304.

The previous prime is 238825395973. The next prime is 238825395997. The reversal of 238825395991 is 199593528832.

It is a de Polignac number, because none of the positive numbers 2^k-238825395991 is a prime.

It is a Smith number, since the sum of its digits (64) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (238825395997) 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, 12915 + ... + 691243.

It is an arithmetic number, because the mean of its divisors is an integer number (9487123380).

Almost surely, 2^238825395991 is an apocalyptic number.

238825395991 is a deficient number, since it is larger than the sum of its proper divisors (64762552169).

238825395991 is a wasteful number, since it uses less digits than its factorization.

238825395991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 678475.

The product of its digits is 41990400, while the sum is 64.

The spelling of 238825395991 in words is "two hundred thirty-eight billion, eight hundred twenty-five million, three hundred ninety-five thousand, nine hundred ninety-one".