67157615381 has 2 divisors, whose sum is σ = 67157615382. Its totient is φ = 67157615380.

The previous prime is 67157615377. The next prime is 67157615417. The reversal of 67157615381 is 18351675176.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61285458481 + 5872156900 = 247559^2 + 76630^2 .

It is a cyclic number.

It is not a de Polignac number, because 67157615381 - 2² = 67157615377 is a prime.

It is a super-2 number, since 2×67157615381² (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 (67157615321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33578807690 + 33578807691.

It is an arithmetic number, because the mean of its divisors is an integer number (33578807691).

Almost surely, 2^67157615381 is an apocalyptic number.

It is an amenable number.

67157615381 is a deficient number, since it is larger than the sum of its proper divisors (1).

67157615381 is an equidigital number, since it uses as much as digits as its factorization.

67157615381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1058400, while the sum is 50.

The spelling of 67157615381 in words is "sixty-seven billion, one hundred fifty-seven million, six hundred fifteen thousand, three hundred eighty-one".