15550209456 has 20 divisors (see below), whose sum is σ = 40171374552. Its totient is φ = 5183403136.

The previous prime is 15550209439. The next prime is 15550209461. The reversal of 15550209456 is 65490205551.

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, 161981301 + ... + 161981396.

Almost surely, 2^15550209456 is an apocalyptic number.

15550209456 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

15550209456 is an abundant number, since it is smaller than the sum of its proper divisors (24621165096).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

15550209456 is a wasteful number, since it uses less digits than its factorization.

15550209456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323962708 (or 323962702 counting only the distinct ones).

The product of its (nonzero) digits is 270000, while the sum is 42.

The spelling of 15550209456 in words is "fifteen billion, five hundred fifty million, two hundred nine thousand, four hundred fifty-six".