67421681145 has 96 divisors (see below), whose sum is σ = 144587649024. Its totient is φ = 28301184000.

The previous prime is 67421681141. The next prime is 67421681149. The reversal of 67421681145 is 54118612476.

67421681145 is a `hidden beast` number, since 6 + 7 + 421 + 6 + 81 + 145 = 666.

It is an interprime number because it is at equal distance from previous prime (67421681141) and next prime (67421681149).

It is not a de Polignac number, because 67421681145 - 2² = 67421681141 is a prime.

It is a super-2 number, since 2×67421681145² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 67421681145.

It is not an unprimeable number, because it can be changed into a prime (67421681141) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 739045 + ... + 825245.

It is an arithmetic number, because the mean of its divisors is an integer number (1506121344).

Almost surely, 2^67421681145 is an apocalyptic number.

67421681145 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

67421681145 is an abundant number, since it is smaller than the sum of its proper divisors (77165967879).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

67421681145 is a wasteful number, since it uses less digits than its factorization.

67421681145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86423 (or 86420 counting only the distinct ones).

The product of its digits is 322560, while the sum is 45.

The spelling of 67421681145 in words is "sixty-seven billion, four hundred twenty-one million, six hundred eighty-one thousand, one hundred forty-five".