10515203440 has 80 divisors (see below), whose sum is σ = 29410974720. Its totient is φ = 3415461120.

The previous prime is 10515203437. The next prime is 10515203509. The reversal of 10515203440 is 4430251501.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×10515203440² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 483496 + ... + 504775.

It is an arithmetic number, because the mean of its divisors is an integer number (367637184).

Almost surely, 2^10515203440 is an apocalyptic number.

10515203440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

10515203440 is an abundant number, since it is smaller than the sum of its proper divisors (18895771280).

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

10515203440 is a wasteful number, since it uses less digits than its factorization.

10515203440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 988310 (or 988304 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

Adding to 10515203440 its reverse (4430251501), we get a palindrome (14945454941).

The spelling of 10515203440 in words is "ten billion, five hundred fifteen million, two hundred three thousand, four hundred forty".