6515657551 has 8 divisors (see below), whose sum is σ = 7027518960. Its totient is φ = 6005318592.

The previous prime is 6515657549. The next prime is 6515657567. The reversal of 6515657551 is 1557565156.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 6515657551 - 2¹ = 6515657549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6515657651) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 371710 + ... + 388843.

It is an arithmetic number, because the mean of its divisors is an integer number (878439870).

Almost surely, 2^6515657551 is an apocalyptic number.

6515657551 is a deficient number, since it is larger than the sum of its proper divisors (511861409).

6515657551 is a wasteful number, since it uses less digits than its factorization.

6515657551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 761225.

The product of its digits is 787500, while the sum is 46.

The square root of 6515657551 is about 80719.6230850962. The cubic root of 6515657551 is about 1867.7528891888.

The spelling of 6515657551 in words is "six billion, five hundred fifteen million, six hundred fifty-seven thousand, five hundred fifty-one".