67720217501 has 2 divisors, whose sum is σ = 67720217502. Its totient is φ = 67720217500.

The previous prime is 67720217441. The next prime is 67720217531. The reversal of 67720217501 is 10571202776.

67720217501 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., 39720888601 + 27999328900 = 199301^2 + 167330^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-67720217501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (67720217531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33860108750 + 33860108751.

It is an arithmetic number, because the mean of its divisors is an integer number (33860108751).

Almost surely, 2^67720217501 is an apocalyptic number.

It is an amenable number.

67720217501 is a deficient number, since it is larger than the sum of its proper divisors (1).

67720217501 is an equidigital number, since it uses as much as digits as its factorization.

67720217501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 41160, while the sum is 38.

The spelling of 67720217501 in words is "sixty-seven billion, seven hundred twenty million, two hundred seventeen thousand, five hundred one".