67254623981 has 2 divisors, whose sum is σ = 67254623982. Its totient is φ = 67254623980.

The previous prime is 67254623977. The next prime is 67254623993. The reversal of 67254623981 is 18932645276.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 46893902500 + 20360721481 = 216550^2 + 142691^2 .

It is a cyclic number.

It is not a de Polignac number, because 67254623981 - 2² = 67254623977 is a prime.

It is a super-2 number, since 2×67254623981² (a number of 22 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (67254623911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33627311990 + 33627311991.

It is an arithmetic number, because the mean of its divisors is an integer number (33627311991).

Almost surely, 2^67254623981 is an apocalyptic number.

It is an amenable number.

67254623981 is a deficient number, since it is larger than the sum of its proper divisors (1).

67254623981 is an equidigital number, since it uses as much as digits as its factorization.

67254623981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4354560, while the sum is 53.

The spelling of 67254623981 in words is "sixty-seven billion, two hundred fifty-four million, six hundred twenty-three thousand, nine hundred eighty-one".