67416521 has 8 divisors (see below), whose sum is σ = 68380200. Its totient is φ = 66457600.

The previous prime is 67416491. The next prime is 67416533. The reversal of 67416521 is 12561476.

It can be written as a sum of positive squares in 4 ways, for example, as 19044496 + 48372025 = 4364^2 + 6955^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 67416521 - 2⁶ = 67416457 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (67416551) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34745 + ... + 36633.

It is an arithmetic number, because the mean of its divisors is an integer number (8547525).

Almost surely, 2^67416521 is an apocalyptic number.

It is an amenable number.

67416521 is a deficient number, since it is larger than the sum of its proper divisors (963679).

67416521 is a wasteful number, since it uses less digits than its factorization.

67416521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2379.

The product of its digits is 10080, while the sum is 32.

The square root of 67416521 is about 8210.7564206960. The cubic root of 67416521 is about 406.9947237150.

Adding to 67416521 its reverse (12561476), we get a palindrome (79977997).

The spelling of 67416521 in words is "sixty-seven million, four hundred sixteen thousand, five hundred twenty-one".