67918913957 has 24 divisors (see below), whose sum is σ = 72938795328. Its totient is φ = 63087147200.

The previous prime is 67918913941. The next prime is 67918913987. The reversal of 67918913957 is 75931981976.

It is not a de Polignac number, because 67918913957 - 2⁴ = 67918913941 is a prime.

It is a super-2 number, since 2×67918913957² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 67918913893 and 67918913902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67918913987) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 138327482 + ... + 138327972.

It is an arithmetic number, because the mean of its divisors is an integer number (3039116472).

Almost surely, 2^67918913957 is an apocalyptic number.

It is an amenable number.

67918913957 is a deficient number, since it is larger than the sum of its proper divisors (5019881371).

67918913957 is an equidigital number, since it uses as much as digits as its factorization.

67918913957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1321 (or 938 counting only the distinct ones).

The product of its digits is 25719120, while the sum is 65.

The spelling of 67918913957 in words is "sixty-seven billion, nine hundred eighteen million, nine hundred thirteen thousand, nine hundred fifty-seven".