15136805993 has 4 divisors (see below), whose sum is σ = 15191451780. Its totient is φ = 15082160208.

The previous prime is 15136805951. The next prime is 15136806007. The reversal of 15136805993 is 39950863151.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3271496809 + 11865309184 = 57197^2 + 108928^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15136805993 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (15136805903) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27322478 + ... + 27323031.

It is an arithmetic number, because the mean of its divisors is an integer number (3797862945).

Almost surely, 2^15136805993 is an apocalyptic number.

It is an amenable number.

15136805993 is a deficient number, since it is larger than the sum of its proper divisors (54645787).

15136805993 is an equidigital number, since it uses as much as digits as its factorization.

15136805993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54645786.

The product of its (nonzero) digits is 874800, while the sum is 50.

The spelling of 15136805993 in words is "fifteen billion, one hundred thirty-six million, eight hundred five thousand, nine hundred ninety-three".