6551621063 has 16 divisors (see below), whose sum is σ = 7261825536. Its totient is φ = 5873424480.

The previous prime is 6551621057. The next prime is 6551621099. The reversal of 6551621063 is 3601261556.

It is a cyclic number.

It is not a de Polignac number, because 6551621063 - 2¹⁴ = 6551604679 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 (6551621033) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8870 + ... + 114812.

It is an arithmetic number, because the mean of its divisors is an integer number (453864096).

Almost surely, 2^6551621063 is an apocalyptic number.

6551621063 is a deficient number, since it is larger than the sum of its proper divisors (710204473).

6551621063 is a wasteful number, since it uses less digits than its factorization.

6551621063 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106094.

The product of its (nonzero) digits is 32400, while the sum is 35.

The square root of 6551621063 is about 80942.0846222779. The cubic root of 6551621063 is about 1871.1829725924.

The spelling of 6551621063 in words is "six billion, five hundred fifty-one million, six hundred twenty-one thousand, sixty-three".