15550215140 has 96 divisors (see below), whose sum is σ = 33958764000. Its totient is φ = 5977210880.

The previous prime is 15550215103. The next prime is 15550215143. The reversal of 15550215140 is 4151205551.

It can be written as a sum of positive squares in 16 ways, for example, as 13936746916 + 1613468224 = 118054^2 + 40168^2 .

It is not an unprimeable number, because it can be changed into a prime (15550215143) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16738196 + ... + 16739124.

It is an arithmetic number, because the mean of its divisors is an integer number (353737125).

Almost surely, 2^15550215140 is an apocalyptic number.

15550215140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15550215140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16979382000).

15550215140 is an abundant number, since it is smaller than the sum of its proper divisors (18408548860).

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

15550215140 is a wasteful number, since it uses less digits than its factorization.

15550215140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1265 (or 1263 counting only the distinct ones).

The product of its (nonzero) digits is 5000, while the sum is 29.

The spelling of 15550215140 in words is "fifteen billion, five hundred fifty million, two hundred fifteen thousand, one hundred forty".