19636136641 has 9 divisors (see below), whose sum is σ = 21585216513. Its totient is φ = 17849632020.

The previous prime is 19636136621. The next prime is 19636136651. The reversal of 19636136641 is 14663163691.

It is a happy number.

The square root of 19636136641 is 140129.

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

It is not a de Polignac number, because 19636136641 - 2⁹ = 19636136129 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19636136591 and 19636136600.

It is not an unprimeable number, because it can be changed into a prime (19636136621) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1535050 + ... + 1547788.

Almost surely, 2^19636136641 is an apocalyptic number.

19636136641 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

19636136641 is the 140129-th square number.

19636136641 is the 70065-th centered octagonal number.

It is an amenable number.

19636136641 is a deficient number, since it is larger than the sum of its proper divisors (1949079872).

19636136641 is an frugal number, since it uses more digits than its factorization.

19636136641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25500 (or 12750 counting only the distinct ones).

The product of its digits is 419904, while the sum is 46.

The spelling of 19636136641 in words is "nineteen billion, six hundred thirty-six million, one hundred thirty-six thousand, six hundred forty-one".