208629394949 has 4 divisors (see below), whose sum is σ = 219609889440. Its totient is φ = 197648900460.

The previous prime is 208629394913. The next prime is 208629394969. The reversal of 208629394949 is 949493926802.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 949493926802 = 2 ⋅474746963401.

It is a cyclic number.

It is not a de Polignac number, because 208629394949 - 2³² = 204334427653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (208629394969) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5490247217 + ... + 5490247254.

It is an arithmetic number, because the mean of its divisors is an integer number (54902472360).

Almost surely, 2^208629394949 is an apocalyptic number.

It is an amenable number.

208629394949 is a deficient number, since it is larger than the sum of its proper divisors (10980494491).

208629394949 is a wasteful number, since it uses less digits than its factorization.

208629394949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10980494490.

The product of its (nonzero) digits is 60466176, while the sum is 65.

The spelling of 208629394949 in words is "two hundred eight billion, six hundred twenty-nine million, three hundred ninety-four thousand, nine hundred forty-nine".