6550551515 has 16 divisors (see below), whose sum is σ = 7901476128. Its totient is φ = 5213273856.

The previous prime is 6550551493. The next prime is 6550551529. The reversal of 6550551515 is 5151550556.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 6550551515 - 2²⁸ = 6282116059 is a prime.

It is a Duffinian 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, 1940369 + ... + 1943741.

It is an arithmetic number, because the mean of its divisors is an integer number (493842258).

Almost surely, 2^6550551515 is an apocalyptic number.

6550551515 is a deficient number, since it is larger than the sum of its proper divisors (1350924613).

6550551515 is a wasteful number, since it uses less digits than its factorization.

6550551515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5278.

The product of its (nonzero) digits is 93750, while the sum is 38.

The square root of 6550551515 is about 80935.4774805215. The cubic root of 6550551515 is about 1871.0811439049.

The spelling of 6550551515 in words is "six billion, five hundred fifty million, five hundred fifty-one thousand, five hundred fifteen".