208029952069 has 12 divisors (see below), whose sum is σ = 217335121324. Its totient is φ = 198976761792.

The previous prime is 208029952061. The next prime is 208029952087. The reversal of 208029952069 is 960259920802.

It can be written as a sum of positive squares in 2 ways, for example, as 184588811044 + 23441141025 = 429638^2 + 153105^2 .

It is not a de Polignac number, because 208029952069 - 2³ = 208029952061 is a prime.

It is a super-2 number, since 2×208029952069² (a number of 23 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (52) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (208029952061) 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 in 11 ways as a sum of consecutive naturals, for example, 678792 + ... + 936385.

Almost surely, 2^208029952069 is an apocalyptic number.

It is an amenable number.

208029952069 is a deficient number, since it is larger than the sum of its proper divisors (9305169255).

208029952069 is an equidigital number, since it uses as much as digits as its factorization.

208029952069 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1615332 (or 1615273 counting only the distinct ones).

The product of its (nonzero) digits is 1399680, while the sum is 52.

The spelling of 208029952069 in words is "two hundred eight billion, twenty-nine million, nine hundred fifty-two thousand, sixty-nine".