667396501 has 2 divisors, whose sum is σ = 667396502. Its totient is φ = 667396500.

The previous prime is 667396487. The next prime is 667396519. The reversal of 667396501 is 105693766.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 646684900 + 20711601 = 25430^2 + 4551^2 .

It is a cyclic number.

It is not a de Polignac number, because 667396501 - 2⁵ = 667396469 is a prime.

It is a super-3 number, since 3×667396501³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (667396531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333698250 + 333698251.

It is an arithmetic number, because the mean of its divisors is an integer number (333698251).

Almost surely, 2^667396501 is an apocalyptic number.

It is an amenable number.

667396501 is a deficient number, since it is larger than the sum of its proper divisors (1).

667396501 is an equidigital number, since it uses as much as digits as its factorization.

667396501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 204120, while the sum is 43.

The square root of 667396501 is about 25834.0182898441. The cubic root of 667396501 is about 873.8991329851.

The spelling of 667396501 in words is "six hundred sixty-seven million, three hundred ninety-six thousand, five hundred one".