15000661855 has 4 divisors (see below), whose sum is σ = 18000794232. Its totient is φ = 12000529480.

The previous prime is 15000661813. The next prime is 15000661873. The reversal of 15000661855 is 55816600051.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55816600051 = 13469 ⋅4144079.

It is not a de Polignac number, because 15000661855 - 2¹³ = 15000653663 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1500066181 + ... + 1500066190.

It is an arithmetic number, because the mean of its divisors is an integer number (4500198558).

Almost surely, 2^15000661855 is an apocalyptic number.

15000661855 is a deficient number, since it is larger than the sum of its proper divisors (3000132377).

15000661855 is an equidigital number, since it uses as much as digits as its factorization.

15000661855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3000132376.

The product of its (nonzero) digits is 36000, while the sum is 37.

The spelling of 15000661855 in words is "fifteen billion, six hundred sixty-one thousand, eight hundred fifty-five".