67656541 has 2 divisors, whose sum is σ = 67656542. Its totient is φ = 67656540.

The previous prime is 67656509. The next prime is 67656553. The reversal of 67656541 is 14565676.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53436100 + 14220441 = 7310^2 + 3771^2 .

It is a cyclic number.

It is not a de Polignac number, because 67656541 - 2⁵ = 67656509 is a prime.

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

It is a junction number, because it is equal to n+sod(n) for n = 67656494 and 67656503.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (67656581) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33828270 + 33828271.

It is an arithmetic number, because the mean of its divisors is an integer number (33828271).

Almost surely, 2^67656541 is an apocalyptic number.

It is an amenable number.

67656541 is a deficient number, since it is larger than the sum of its proper divisors (1).

67656541 is an equidigital number, since it uses as much as digits as its factorization.

67656541 is an evil number, because the sum of its binary digits is even.

The product of its digits is 151200, while the sum is 40.

The square root of 67656541 is about 8225.3596273962. The cubic root of 67656541 is about 407.4771532978.

The spelling of 67656541 in words is "sixty-seven million, six hundred fifty-six thousand, five hundred forty-one".