19802063902401 has 63 divisors (see below), whose sum is σ = 32636107030737. Its totient is φ = 12000449858760.

The previous prime is 19802063902351. The next prime is 19802063902421. The reversal of 19802063902401 is 10420936020891.

The square root of 19802063902401 is 4449951.

It is a perfect power (a square), and thus also a powerful number.

19802063902401 is a `hidden beast` number, since 1 + 9 + 8 + 0 + 2 + 0 + 639 + 0 + 2 + 4 + 0 + 1 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-19802063902401 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19802063902421) by changing a digit.

It is a polite number, since it can be written in 62 ways as a sum of consecutive naturals, for example, 1321627956 + ... + 1321642938.

Almost surely, 2^{19802063902401} is an apocalyptic number.

19802063902401 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

19802063902401 is the 4449951-st square number.

19802063902401 is the 2224976-th centered octagonal number.

It is an amenable number.

19802063902401 is a deficient number, since it is larger than the sum of its proper divisors (12834043128336).

19802063902401 is an frugal number, since it uses more digits than its factorization.

19802063902401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30006 (or 14997 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 45.

The spelling of 19802063902401 in words is "nineteen trillion, eight hundred two billion, sixty-three million, nine hundred two thousand, four hundred one".