15120243555 has 16 divisors (see below), whose sum is σ = 24197425920. Its totient is φ = 8062451168.

The previous prime is 15120243511. The next prime is 15120243557. The reversal of 15120243555 is 55534202151.

It is a cyclic number.

It is not a de Polignac number, because 15120243555 - 2⁹ = 15120243043 is a prime.

It is not an unprimeable number, because it can be changed into a prime (15120243557) 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, 28677 + ... + 176246.

It is an arithmetic number, because the mean of its divisors is an integer number (1512339120).

Almost surely, 2^15120243555 is an apocalyptic number.

15120243555 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

15120243555 is a deficient number, since it is larger than the sum of its proper divisors (9077182365).

15120243555 is a wasteful number, since it uses less digits than its factorization.

15120243555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209850.

The product of its (nonzero) digits is 30000, while the sum is 33.

The spelling of 15120243555 in words is "fifteen billion, one hundred twenty million, two hundred forty-three thousand, five hundred fifty-five".