67930381781 has 4 divisors (see below), whose sum is σ = 68275206252. Its totient is φ = 67585557312.

The previous prime is 67930381763. The next prime is 67930381817. The reversal of 67930381781 is 18718303976.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 59687376100 + 8243005681 = 244310^2 + 90791^2 .

It is a cyclic number.

It is not a de Polignac number, because 67930381781 - 2³⁰ = 66856639957 is a prime.

It is a super-3 number, since 3×67930381781³ (a number of 33 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67930341781) 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, 172411940 + ... + 172412333.

It is an arithmetic number, because the mean of its divisors is an integer number (17068801563).

Almost surely, 2^67930381781 is an apocalyptic number.

It is an amenable number.

67930381781 is a deficient number, since it is larger than the sum of its proper divisors (344824471).

67930381781 is a wasteful number, since it uses less digits than its factorization.

67930381781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344824470.

The product of its (nonzero) digits is 1524096, while the sum is 53.

The spelling of 67930381781 in words is "sixty-seven billion, nine hundred thirty million, three hundred eighty-one thousand, seven hundred eighty-one".