15541968609 has 16 divisors (see below), whose sum is σ = 23134271040. Its totient is φ = 10312202880.

The previous prime is 15541968587. The next prime is 15541968613. The reversal of 15541968609 is 90686914551.

15541968609 is a `hidden beast` number, since 1 + 5 + 541 + 96 + 8 + 6 + 0 + 9 = 666.

It is not a de Polignac number, because 15541968609 - 2⁹ = 15541968097 is a prime.

It is not an unprimeable number, because it can be changed into a prime (15541968679) 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, 1358352 + ... + 1369745.

It is an arithmetic number, because the mean of its divisors is an integer number (1445891940).

Almost surely, 2^15541968609 is an apocalyptic number.

It is an amenable number.

15541968609 is a deficient number, since it is larger than the sum of its proper divisors (7592302431).

15541968609 is a wasteful number, since it uses less digits than its factorization.

15541968609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2728317 (or 2728311 counting only the distinct ones).

The product of its (nonzero) digits is 2332800, while the sum is 54.

The spelling of 15541968609 in words is "fifteen billion, five hundred forty-one million, nine hundred sixty-eight thousand, six hundred nine".