81603562228 has 6 divisors (see below), whose sum is σ = 142806233906. Its totient is φ = 40801781112.

The previous prime is 81603562217. The next prime is 81603562259. The reversal of 81603562228 is 82226530618.

It can be written as a sum of positive squares in only one way, i.e., 81537660304 + 65901924 = 285548^2 + 8118^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10200445275 + ... + 10200445282.

Almost surely, 2^81603562228 is an apocalyptic number.

It is an amenable number.

81603562228 is a deficient number, since it is larger than the sum of its proper divisors (61202671678).

81603562228 is a wasteful number, since it uses less digits than its factorization.

81603562228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20400890561 (or 20400890559 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 43.

The spelling of 81603562228 in words is "eighty-one billion, six hundred three million, five hundred sixty-two thousand, two hundred twenty-eight".