15215515000000 has 448 divisors, whose sum is σ = 43433888808960. Its totient is φ = 5180400000000.

The previous prime is 15215514999977. The next prime is 15215515000001. The reversal of 15215515000000 is 51551251.

It is a tau number, because it is divible by the number of its divisors (448).

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (15215515000001) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 5284998561 + ... + 5285001439.

Almost surely, 2^{15215515000000} is an apocalyptic number.

15215515000000 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 15215515000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21716944404480).

15215515000000 is an abundant number, since it is smaller than the sum of its proper divisors (28218373808960).

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

15215515000000 is an frugal number, since it uses more digits than its factorization.

15215515000000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3084 (or 3044 counting only the distinct ones).

The product of its (nonzero) digits is 1250, while the sum is 25.

Adding to 15215515000000 its reverse (51551251), we get a palindrome (15215566551251).

The spelling of 15215515000000 in words is "fifteen trillion, two hundred fifteen billion, five hundred fifteen million", and thus it is an aban number.