67661225537 has 2 divisors, whose sum is σ = 67661225538. Its totient is φ = 67661225536.

The previous prime is 67661225501. The next prime is 67661225551. The reversal of 67661225537 is 73552216676.

67661225537 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 67649929216 + 11296321 = 260096^2 + 3361^2 .

It is a cyclic number.

It is not a de Polignac number, because 67661225537 - 2⁶ = 67661225473 is a prime.

It is not a weakly prime, because it can be changed into another prime (67661225837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33830612768 + 33830612769.

It is an arithmetic number, because the mean of its divisors is an integer number (33830612769).

Almost surely, 2^67661225537 is an apocalyptic number.

It is an amenable number.

67661225537 is a deficient number, since it is larger than the sum of its proper divisors (1).

67661225537 is an equidigital number, since it uses as much as digits as its factorization.

67661225537 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3175200, while the sum is 50.

The spelling of 67661225537 in words is "sixty-seven billion, six hundred sixty-one million, two hundred twenty-five thousand, five hundred thirty-seven".