664961169407 has 2 divisors, whose sum is σ = 664961169408. Its totient is φ = 664961169406.

The previous prime is 664961169401. The next prime is 664961169421. The reversal of 664961169407 is 704961169466.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 664961169407 - 2⁶ = 664961169343 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (664961169401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332480584703 + 332480584704.

It is an arithmetic number, because the mean of its divisors is an integer number (332480584704).

Almost surely, 2^664961169407 is an apocalyptic number.

664961169407 is a deficient number, since it is larger than the sum of its proper divisors (1).

664961169407 is an equidigital number, since it uses as much as digits as its factorization.

664961169407 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11757312, while the sum is 59.

Adding to 664961169407 its sum of digits (59), we get a palindrome (664961169466).

The spelling of 664961169407 in words is "six hundred sixty-four billion, nine hundred sixty-one million, one hundred sixty-nine thousand, four hundred seven".