67601891421 has 24 divisors (see below), whose sum is σ = 98145503456. Its totient is φ = 44838087840.

The previous prime is 67601891333. The next prime is 67601891519. The reversal of 67601891421 is 12419810676.

67601891421 is a `hidden beast` number, since 6 + 7 + 601 + 8 + 9 + 14 + 21 = 666.

It is not a de Polignac number, because 67601891421 - 2¹⁰ = 67601890397 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67601896421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7597251 + ... + 7606143.

Almost surely, 2^67601891421 is an apocalyptic number.

It is an amenable number.

67601891421 is a deficient number, since it is larger than the sum of its proper divisors (30543612035).

67601891421 is a wasteful number, since it uses less digits than its factorization.

67601891421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13113 (or 13110 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 45.

The spelling of 67601891421 in words is "sixty-seven billion, six hundred one million, eight hundred ninety-one thousand, four hundred twenty-one".