67918913987 has 2 divisors, whose sum is σ = 67918913988. Its totient is φ = 67918913986.

The previous prime is 67918913941. The next prime is 67918914143. The reversal of 67918913987 is 78931981976.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 67918913987 - 2²² = 67914719683 is a prime.

It is a super-2 number, since 2×67918913987² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (67918910987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33959456993 + 33959456994.

It is an arithmetic number, because the mean of its divisors is an integer number (33959456994).

Almost surely, 2^67918913987 is an apocalyptic number.

67918913987 is a deficient number, since it is larger than the sum of its proper divisors (1).

67918913987 is an equidigital number, since it uses as much as digits as its factorization.

67918913987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 41150592, while the sum is 68.

The spelling of 67918913987 in words is "sixty-seven billion, nine hundred eighteen million, nine hundred thirteen thousand, nine hundred eighty-seven".