67420641623 has 2 divisors, whose sum is σ = 67420641624. Its totient is φ = 67420641622.

The previous prime is 67420641583. The next prime is 67420641667. The reversal of 67420641623 is 32614602476.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-67420641623 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (67420641023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33710320811 + 33710320812.

It is an arithmetic number, because the mean of its divisors is an integer number (33710320812).

Almost surely, 2^67420641623 is an apocalyptic number.

67420641623 is a deficient number, since it is larger than the sum of its proper divisors (1).

67420641623 is an equidigital number, since it uses as much as digits as its factorization.

67420641623 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 290304, while the sum is 41.

The spelling of 67420641623 in words is "sixty-seven billion, four hundred twenty million, six hundred forty-one thousand, six hundred twenty-three".