667521111705373 has 2 divisors, whose sum is σ = 667521111705374. Its totient is φ = 667521111705372.

The previous prime is 667521111705293. The next prime is 667521111705451. The reversal of 667521111705373 is 373507111125766.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 591203031320889 + 76318080384484 = 24314667^2 + 8736022^2 .

It is a cyclic number.

It is not a de Polignac number, because 667521111705373 - 2¹⁷ = 667521111574301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (667521111703373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333760555852686 + 333760555852687.

It is an arithmetic number, because the mean of its divisors is an integer number (333760555852687).

Almost surely, 2^{667521111705373} is an apocalyptic number.

It is an amenable number.

667521111705373 is a deficient number, since it is larger than the sum of its proper divisors (1).

667521111705373 is an equidigital number, since it uses as much as digits as its factorization.

667521111705373 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5556600, while the sum is 55.

The spelling of 667521111705373 in words is "six hundred sixty-seven trillion, five hundred twenty-one billion, one hundred eleven million, seven hundred five thousand, three hundred seventy-three".