19903361636 has 6 divisors (see below), whose sum is σ = 34830882870. Its totient is φ = 9951680816.

The previous prime is 19903361617. The next prime is 19903361651. The reversal of 19903361636 is 63616330991.

It can be written as a sum of positive squares in only one way, i.e., 19059459136 + 843902500 = 138056^2 + 29050^2 .

It is a super-2 number, since 2×19903361636² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2487920201 + ... + 2487920208.

It is an arithmetic number, because the mean of its divisors is an integer number (5805147145).

Almost surely, 2^19903361636 is an apocalyptic number.

It is an amenable number.

19903361636 is a deficient number, since it is larger than the sum of its proper divisors (14927521234).

19903361636 is a wasteful number, since it uses less digits than its factorization.

19903361636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4975840413 (or 4975840411 counting only the distinct ones).

The product of its (nonzero) digits is 472392, while the sum is 47.

The spelling of 19903361636 in words is "nineteen billion, nine hundred three million, three hundred sixty-one thousand, six hundred thirty-six".