6551215657 has 8 divisors (see below), whose sum is σ = 7487612096. Its totient is φ = 5614946352.

The previous prime is 6551215609. The next prime is 6551215661. The reversal of 6551215657 is 7565121556.

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

It is a cyclic number.

It is not a de Polignac number, because 6551215657 - 2⁷ = 6551215529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6551215057) 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, 142018 + ... + 182404.

It is an arithmetic number, because the mean of its divisors is an integer number (935951512).

Almost surely, 2^6551215657 is an apocalyptic number.

It is an amenable number.

6551215657 is a deficient number, since it is larger than the sum of its proper divisors (936396439).

6551215657 is a wasteful number, since it uses less digits than its factorization.

6551215657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63567.

The product of its digits is 315000, while the sum is 43.

The square root of 6551215657 is about 80939.5802867793. The cubic root of 6551215657 is about 1871.1443763201.

The spelling of 6551215657 in words is "six billion, five hundred fifty-one million, two hundred fifteen thousand, six hundred fifty-seven".