67734078751621 has 2 divisors, whose sum is σ = 67734078751622. Its totient is φ = 67734078751620.

The previous prime is 67734078751609. The next prime is 67734078751631. The reversal of 67734078751621 is 12615787043776.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45256713290721 + 22477365460900 = 6727311^2 + 4741030^2 .

It is a cyclic number.

It is not a de Polignac number, because 67734078751621 - 2²⁹ = 67733541880709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (67734078751631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33867039375810 + 33867039375811.

It is an arithmetic number, because the mean of its divisors is an integer number (33867039375811).

Almost surely, 2^{67734078751621} is an apocalyptic number.

It is an amenable number.

67734078751621 is a deficient number, since it is larger than the sum of its proper divisors (1).

67734078751621 is an equidigital number, since it uses as much as digits as its factorization.

67734078751621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 82978560, while the sum is 64.

The spelling of 67734078751621 in words is "sixty-seven trillion, seven hundred thirty-four billion, seventy-eight million, seven hundred fifty-one thousand, six hundred twenty-one".