19135640641 has 16 divisors (see below), whose sum is σ = 20833049664. Its totient is φ = 17470960704.

The previous prime is 19135640609. The next prime is 19135640681. The reversal of 19135640641 is 14604653191.

It is a cyclic number.

It is not a de Polignac number, because 19135640641 - 2⁵ = 19135640609 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19135640594 and 19135640603.

It is not an unprimeable number, because it can be changed into a prime (19135640681) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 897790 + ... + 918856.

It is an arithmetic number, because the mean of its divisors is an integer number (1302065604).

Almost surely, 2^19135640641 is an apocalyptic number.

It is an amenable number.

19135640641 is a deficient number, since it is larger than the sum of its proper divisors (1697409023).

19135640641 is a wasteful number, since it uses less digits than its factorization.

19135640641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21840.

The product of its (nonzero) digits is 77760, while the sum is 40.

The spelling of 19135640641 in words is "nineteen billion, one hundred thirty-five million, six hundred forty thousand, six hundred forty-one".