15555555506 has 8 divisors (see below), whose sum is σ = 23333864304. Its totient is φ = 7777600740.

The previous prime is 15555555467. The next prime is 15555555511. The reversal of 15555555506 is 60555555551.

It is a sphenic number, since it is the product of 3 distinct primes.

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, 114101 + ... + 210071.

It is an arithmetic number, because the mean of its divisors is an integer number (2916733038).

Almost surely, 2^15555555506 is an apocalyptic number.

15555555506 is a deficient number, since it is larger than the sum of its proper divisors (7778308798).

15555555506 is an equidigital number, since it uses as much as digits as its factorization.

15555555506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177016.

The product of its (nonzero) digits is 2343750, while the sum is 47.

The spelling of 15555555506 in words is "fifteen billion, five hundred fifty-five million, five hundred fifty-five thousand, five hundred six".