19561932945 has 40 divisors (see below), whose sum is σ = 36197779200. Its totient is φ = 10096475040.

The previous prime is 19561932913. The next prime is 19561932947. The reversal of 19561932945 is 54923916591.

19561932945 is a `hidden beast` number, since 1 + 9 + 561 + 9 + 32 + 9 + 45 = 666.

It is not a de Polignac number, because 19561932945 - 2⁵ = 19561932913 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19561932891 and 19561932900.

It is not an unprimeable number, because it can be changed into a prime (19561932947) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 766495 + ... + 791604.

It is an arithmetic number, because the mean of its divisors is an integer number (904944480).

Almost surely, 2^19561932945 is an apocalyptic number.

19561932945 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

19561932945 is a deficient number, since it is larger than the sum of its proper divisors (16635846255).

19561932945 is a wasteful number, since it uses less digits than its factorization.

19561932945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1558147 (or 1558138 counting only the distinct ones).

The product of its digits is 2624400, while the sum is 54.

The spelling of 19561932945 in words is "nineteen billion, five hundred sixty-one million, nine hundred thirty-two thousand, nine hundred forty-five".