6654255021 has 6 divisors (see below), whose sum is σ = 9611701710. Its totient is φ = 4436170008.

The previous prime is 6654255019. The next prime is 6654255037. The reversal of 6654255021 is 1205524566.

6654255021 is a `hidden beast` number, since 6 + 65 + 42 + 550 + 2 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 5774480100 + 879774921 = 75990^2 + 29661^2 .

It is not a de Polignac number, because 6654255021 - 2¹ = 6654255019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6654255071) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 369680826 + ... + 369680843.

It is an arithmetic number, because the mean of its divisors is an integer number (1601950285).

Almost surely, 2^6654255021 is an apocalyptic number.

It is an amenable number.

6654255021 is a deficient number, since it is larger than the sum of its proper divisors (2957446689).

6654255021 is a wasteful number, since it uses less digits than its factorization.

6654255021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 739361675 (or 739361672 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 36.

The square root of 6654255021 is about 81573.6171871764. The cubic root of 6654255021 is about 1880.9033516084.

Adding to 6654255021 its reverse (1205524566), we get a palindrome (7859779587).

The spelling of 6654255021 in words is "six billion, six hundred fifty-four million, two hundred fifty-five thousand, twenty-one".