208612657349 has 4 divisors (see below), whose sum is σ = 208613708736. Its totient is φ = 208611605964.

The previous prime is 208612657301. The next prime is 208612657411. The reversal of 208612657349 is 943756216802.

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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 208612657349 - 2¹² = 208612653253 is a prime.

It is a super-2 number, since 2×208612657349² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 208612657349.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (208612651349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 127559 + ... + 658404.

It is an arithmetic number, because the mean of its divisors is an integer number (52153427184).

It is a 1-persistent number, because it is pandigital, but 2⋅208612657349 = 417225314698 is not.

Almost surely, 2^208612657349 is an apocalyptic number.

It is an amenable number.

208612657349 is a deficient number, since it is larger than the sum of its proper divisors (1051387).

208612657349 is an equidigital number, since it uses as much as digits as its factorization.

208612657349 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1051386.

The product of its (nonzero) digits is 4354560, while the sum is 53.

The spelling of 208612657349 in words is "two hundred eight billion, six hundred twelve million, six hundred fifty-seven thousand, three hundred forty-nine".