239940813649681 has 4 divisors (see below), whose sum is σ = 252569277526000. Its totient is φ = 227312349773364.

The previous prime is 239940813649639. The next prime is 239940813649687. The reversal of 239940813649681 is 186946318049932.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 239940813649681 - 2²⁵ = 239940780095249 is a prime.

It is a super-2 number, since 2×239940813649681² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (239940813649687) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6314231938131 + ... + 6314231938168.

It is an arithmetic number, because the mean of its divisors is an integer number (63142319381500).

Almost surely, 2^{239940813649681} is an apocalyptic number.

It is an amenable number.

239940813649681 is a deficient number, since it is larger than the sum of its proper divisors (12628463876319).

239940813649681 is a wasteful number, since it uses less digits than its factorization.

239940813649681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12628463876318.

The product of its (nonzero) digits is 483729408, while the sum is 73.

The spelling of 239940813649681 in words is "two hundred thirty-nine trillion, nine hundred forty billion, eight hundred thirteen million, six hundred forty-nine thousand, six hundred eighty-one".