15601909138191 has 12 divisors (see below), whose sum is σ = 23060186116968. Its totient is φ = 10159382694384.

The previous prime is 15601909138181. The next prime is 15601909138199. The reversal of 15601909138191 is 19183190910651.

15601909138191 is a `hidden beast` number, since 1 + 5 + 6 + 0 + 1 + 90 + 91 + 381 + 91 = 666.

It is not a de Polignac number, because 15601909138191 - 2⁷ = 15601909138063 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15601909138199) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20157504960 + ... + 20157505733.

It is an arithmetic number, because the mean of its divisors is an integer number (1921682176414).

Almost surely, 2^{15601909138191} is an apocalyptic number.

15601909138191 is a deficient number, since it is larger than the sum of its proper divisors (7458276978777).

15601909138191 is a wasteful number, since it uses less digits than its factorization.

15601909138191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40315010742 (or 40315010739 counting only the distinct ones).

The product of its (nonzero) digits is 524880, while the sum is 54.

The spelling of 15601909138191 in words is "fifteen trillion, six hundred one billion, nine hundred nine million, one hundred thirty-eight thousand, one hundred ninety-one".