67921669427 has 4 divisors (see below), whose sum is σ = 67927373280. Its totient is φ = 67915965576.

The previous prime is 67921669421. The next prime is 67921669493. The reversal of 67921669427 is 72496612976.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 67921669427 - 2³² = 63626702131 is a prime.

It is a super-2 number, since 2×67921669427² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (67921669421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2834027 + ... + 2857892.

It is an arithmetic number, because the mean of its divisors is an integer number (16981843320).

Almost surely, 2^67921669427 is an apocalyptic number.

67921669427 is a deficient number, since it is larger than the sum of its proper divisors (5703853).

67921669427 is a wasteful number, since it uses less digits than its factorization.

67921669427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5703852.

The product of its digits is 13716864, while the sum is 59.

The spelling of 67921669427 in words is "sixty-seven billion, nine hundred twenty-one million, six hundred sixty-nine thousand, four hundred twenty-seven".