15117805845 has 16 divisors (see below), whose sum is σ = 26876099520. Its totient is φ = 8062829712.

The previous prime is 15117805841. The next prime is 15117805847. The reversal of 15117805845 is 54850871151.

15117805845 is a `hidden beast` number, since 1 + 51 + 17 + 8 + 0 + 584 + 5 = 666.

It is not a de Polignac number, because 15117805845 - 2² = 15117805841 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 15117805845.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15117805841) 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, 55991739 + ... + 55992008.

It is an arithmetic number, because the mean of its divisors is an integer number (1679756220).

Almost surely, 2^15117805845 is an apocalyptic number.

15117805845 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

15117805845 is a deficient number, since it is larger than the sum of its proper divisors (11758293675).

15117805845 is a wasteful number, since it uses less digits than its factorization.

15117805845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111983761 (or 111983755 counting only the distinct ones).

The product of its (nonzero) digits is 224000, while the sum is 45.

The spelling of 15117805845 in words is "fifteen billion, one hundred seventeen million, eight hundred five thousand, eight hundred forty-five".