6515662440 has 128 divisors (see below), whose sum is σ = 22376113920. Its totient is φ = 1486848000.

The previous prime is 6515662427. The next prime is 6515662453. The reversal of 6515662440 is 442665156.

It is an interprime number because it is at equal distance from previous prime (6515662427) and next prime (6515662453).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 532390 + ... + 544490.

It is an arithmetic number, because the mean of its divisors is an integer number (174813390).

Almost surely, 2^6515662440 is an apocalyptic number.

6515662440 is a gapful number since it is divisible by the number (60) 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 6515662440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11188056960).

6515662440 is an abundant number, since it is smaller than the sum of its proper divisors (15860451480).

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

6515662440 is a wasteful number, since it uses less digits than its factorization.

6515662440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12763 (or 12759 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 39.

The square root of 6515662440 is about 80719.6533689287. The cubic root of 6515662440 is about 1867.7533563425.

The spelling of 6515662440 in words is "six billion, five hundred fifteen million, six hundred sixty-two thousand, four hundred forty".