67057031381 has 2 divisors, whose sum is σ = 67057031382. Its totient is φ = 67057031380.

The previous prime is 67057031339. The next prime is 67057031413. The reversal of 67057031381 is 18313075076.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42710422225 + 24346609156 = 206665^2 + 156034^2 .

It is a cyclic number.

It is not a de Polignac number, because 67057031381 - 2³⁰ = 65983289557 is a prime.

It is a super-2 number, since 2×67057031381² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (67057031311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33528515690 + 33528515691.

It is an arithmetic number, because the mean of its divisors is an integer number (33528515691).

Almost surely, 2^67057031381 is an apocalyptic number.

It is an amenable number.

67057031381 is a deficient number, since it is larger than the sum of its proper divisors (1).

67057031381 is an equidigital number, since it uses as much as digits as its factorization.

67057031381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 105840, while the sum is 41.

The spelling of 67057031381 in words is "sixty-seven billion, fifty-seven million, thirty-one thousand, three hundred eighty-one".