6515123740 has 24 divisors (see below), whose sum is σ = 13683312720. Its totient is φ = 2605753728.

The previous prime is 6515123729. The next prime is 6515123767. The reversal of 6515123740 is 473215156.

It is a junction number, because it is equal to n+sod(n) for n = 6515123696 and 6515123705.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 278539 + ... + 301021.

It is an arithmetic number, because the mean of its divisors is an integer number (570138030).

Almost surely, 2^6515123740 is an apocalyptic number.

It is an amenable number.

6515123740 is an abundant number, since it is smaller than the sum of its proper divisors (7168188980).

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

6515123740 is a wasteful number, since it uses less digits than its factorization.

6515123740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36981 (or 36979 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 34.

The square root of 6515123740 is about 80716.3164422163. The cubic root of 6515123740 is about 1867.7018810718.

Adding to 6515123740 its reverse (473215156), we get a palindrome (6988338896).

The spelling of 6515123740 in words is "six billion, five hundred fifteen million, one hundred twenty-three thousand, seven hundred forty".