66719123501 has 2 divisors, whose sum is σ = 66719123502. Its totient is φ = 66719123500.

The previous prime is 66719123477. The next prime is 66719123509. The reversal of 66719123501 is 10532191766.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66705975625 + 13147876 = 258275^2 + 3626^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66719123501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66719123509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33359561750 + 33359561751.

It is an arithmetic number, because the mean of its divisors is an integer number (33359561751).

Almost surely, 2^66719123501 is an apocalyptic number.

It is an amenable number.

66719123501 is a deficient number, since it is larger than the sum of its proper divisors (1).

66719123501 is an equidigital number, since it uses as much as digits as its factorization.

66719123501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 68040, while the sum is 41.

The spelling of 66719123501 in words is "sixty-six billion, seven hundred nineteen million, one hundred twenty-three thousand, five hundred one".