228621934637 has 2 divisors, whose sum is σ = 228621934638. Its totient is φ = 228621934636.

The previous prime is 228621934633. The next prime is 228621934693. The reversal of 228621934637 is 736439126822.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 228618815881 + 3118756 = 478141^2 + 1766^2 .

It is a cyclic number.

It is not a de Polignac number, because 228621934637 - 2² = 228621934633 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (228621934633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114310967318 + 114310967319.

It is an arithmetic number, because the mean of its divisors is an integer number (114310967319).

Almost surely, 2^228621934637 is an apocalyptic number.

It is an amenable number.

228621934637 is a deficient number, since it is larger than the sum of its proper divisors (1).

228621934637 is an equidigital number, since it uses as much as digits as its factorization.

228621934637 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5225472, while the sum is 53.

The spelling of 228621934637 in words is "two hundred twenty-eight billion, six hundred twenty-one million, nine hundred thirty-four thousand, six hundred thirty-seven".