667216217501 has 2 divisors, whose sum is σ = 667216217502. Its totient is φ = 667216217500.

The previous prime is 667216217449. The next prime is 667216217509. The reversal of 667216217501 is 105712612766.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 495510405625 + 171705811876 = 703925^2 + 414374^2 .

It is a cyclic number.

It is not a de Polignac number, because 667216217501 - 2³⁴ = 650036348317 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (667216217509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333608108750 + 333608108751.

It is an arithmetic number, because the mean of its divisors is an integer number (333608108751).

Almost surely, 2^667216217501 is an apocalyptic number.

It is an amenable number.

667216217501 is a deficient number, since it is larger than the sum of its proper divisors (1).

667216217501 is an equidigital number, since it uses as much as digits as its factorization.

667216217501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 211680, while the sum is 44.

The spelling of 667216217501 in words is "six hundred sixty-seven billion, two hundred sixteen million, two hundred seventeen thousand, five hundred one".