6516256540 has 24 divisors (see below), whose sum is σ = 13857359040. Its totient is φ = 2573508288.

The previous prime is 6516256501. The next prime is 6516256573. The reversal of 6516256540 is 456526156.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 6516256493 and 6516256502.

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, 2060527 + ... + 2063686.

It is an arithmetic number, because the mean of its divisors is an integer number (577389960).

Almost surely, 2^6516256540 is an apocalyptic number.

It is an amenable number.

6516256540 is an abundant number, since it is smaller than the sum of its proper divisors (7341102500).

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

6516256540 is a wasteful number, since it uses less digits than its factorization.

6516256540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4124301 (or 4124299 counting only the distinct ones).

The product of its (nonzero) digits is 216000, while the sum is 40.

The square root of 6516256540 is about 80723.3333058045. Note that the first 4 decimals coincide. The cubic root of 6516256540 is about 1867.8101220490.

The spelling of 6516256540 in words is "six billion, five hundred sixteen million, two hundred fifty-six thousand, five hundred forty".