208985961437 has 16 divisors (see below), whose sum is σ = 236050151424. Its totient is φ = 183303054000.

The previous prime is 208985961421. The next prime is 208985961439. The reversal of 208985961437 is 734169589802.

It is not a de Polignac number, because 208985961437 - 2⁴ = 208985961421 is a prime.

It is a super-2 number, since 2×208985961437² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 208985961437.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (208985961439) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 812903 + ... + 1038644.

It is an arithmetic number, because the mean of its divisors is an integer number (14753134464).

It is a 1-persistent number, because it is pandigital, but 2⋅208985961437 = 417971922874 is not.

Almost surely, 2^208985961437 is an apocalyptic number.

It is an amenable number.

208985961437 is a deficient number, since it is larger than the sum of its proper divisors (27064189987).

208985961437 is a wasteful number, since it uses less digits than its factorization.

208985961437 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1851920.

The product of its (nonzero) digits is 26127360, while the sum is 62.

The spelling of 208985961437 in words is "two hundred eight billion, nine hundred eighty-five million, nine hundred sixty-one thousand, four hundred thirty-seven".