19427199561 has 48 divisors (see below), whose sum is σ = 34999111680. Its totient is φ = 10088206560.

The previous prime is 19427199529. The next prime is 19427199563. The reversal of 19427199561 is 16599172491.

It is a happy number.

19427199561 is a `hidden beast` number, since 1 + 9 + 4 + 2 + 71 + 9 + 9 + 561 = 666.

It is not a de Polignac number, because 19427199561 - 2⁵ = 19427199529 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19427199498 and 19427199507.

It is not an unprimeable number, because it can be changed into a prime (19427199563) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3211806 + ... + 3217848.

It is an arithmetic number, because the mean of its divisors is an integer number (729148160).

Almost surely, 2^19427199561 is an apocalyptic number.

19427199561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

19427199561 is a deficient number, since it is larger than the sum of its proper divisors (15571912119).

19427199561 is a wasteful number, since it uses less digits than its factorization.

19427199561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10706 (or 10703 counting only the distinct ones).

The product of its digits is 1224720, while the sum is 54.

The spelling of 19427199561 in words is "nineteen billion, four hundred twenty-seven million, one hundred ninety-nine thousand, five hundred sixty-one".