67661225837 has 2 divisors, whose sum is σ = 67661225838. Its totient is φ = 67661225836.

The previous prime is 67661225833. The next prime is 67661225843. The reversal of 67661225837 is 73852216676.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55679953156 + 11981272681 = 235966^2 + 109459^2 .

It is a cyclic number.

It is not a de Polignac number, because 67661225837 - 2² = 67661225833 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (67661225833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33830612918 + 33830612919.

It is an arithmetic number, because the mean of its divisors is an integer number (33830612919).

Almost surely, 2^67661225837 is an apocalyptic number.

It is an amenable number.

67661225837 is a deficient number, since it is larger than the sum of its proper divisors (1).

67661225837 is an equidigital number, since it uses as much as digits as its factorization.

67661225837 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5080320, while the sum is 53.

The spelling of 67661225837 in words is "sixty-seven billion, six hundred sixty-one million, two hundred twenty-five thousand, eight hundred thirty-seven".