19904195061 has 24 divisors (see below), whose sum is σ = 28919730840. Its totient is φ = 13191552000.

The previous prime is 19904195041. The next prime is 19904195107. The reversal of 19904195061 is 16059140991.

19904195061 is a `hidden beast` number, since 19 + 90 + 41 + 9 + 506 + 1 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 8029952100 + 11874242961 = 89610^2 + 108969^2 .

It is not a de Polignac number, because 19904195061 - 2¹⁴ = 19904178677 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19904194998 and 19904195016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19904195021) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1295935 + ... + 1311203.

It is an arithmetic number, because the mean of its divisors is an integer number (1204988785).

Almost surely, 2^19904195061 is an apocalyptic number.

It is an amenable number.

19904195061 is a deficient number, since it is larger than the sum of its proper divisors (9015535779).

19904195061 is a wasteful number, since it uses less digits than its factorization.

19904195061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16117 (or 16114 counting only the distinct ones).

The product of its (nonzero) digits is 87480, while the sum is 45.

The spelling of 19904195061 in words is "nineteen billion, nine hundred four million, one hundred ninety-five thousand, sixty-one".