640829201269 has 2 divisors, whose sum is σ = 640829201270. Its totient is φ = 640829201268.

The previous prime is 640829201261. The next prime is 640829201303. The reversal of 640829201269 is 962102928046.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 349887629169 + 290941572100 = 591513^2 + 539390^2 .

It is a cyclic number.

It is not a de Polignac number, because 640829201269 - 2³ = 640829201261 is a prime.

It is a super-2 number, since 2×640829201269² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (640829201261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320414600634 + 320414600635.

It is an arithmetic number, because the mean of its divisors is an integer number (320414600635).

Almost surely, 2^640829201269 is an apocalyptic number.

It is an amenable number.

640829201269 is a deficient number, since it is larger than the sum of its proper divisors (1).

640829201269 is an equidigital number, since it uses as much as digits as its factorization.

640829201269 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 746496, while the sum is 49.

The spelling of 640829201269 in words is "six hundred forty billion, eight hundred twenty-nine million, two hundred one thousand, two hundred sixty-nine".