6650253661 has 4 divisors (see below), whose sum is σ = 6679294300. Its totient is φ = 6621213024.

The previous prime is 6650253637. The next prime is 6650253677. The reversal of 6650253661 is 1663520566.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2849531161 + 3800722500 = 53381^2 + 61650^2 .

It is a cyclic number.

It is not a de Polignac number, because 6650253661 - 2⁵ = 6650253629 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 (6650253601) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14519976 + ... + 14520433.

It is an arithmetic number, because the mean of its divisors is an integer number (1669823575).

Almost surely, 2^6650253661 is an apocalyptic number.

It is an amenable number.

6650253661 is a deficient number, since it is larger than the sum of its proper divisors (29040639).

6650253661 is a wasteful number, since it uses less digits than its factorization.

6650253661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29040638.

The product of its (nonzero) digits is 194400, while the sum is 40.

The square root of 6650253661 is about 81549.0874320492. The cubic root of 6650253661 is about 1880.5262655449.

The spelling of 6650253661 in words is "six billion, six hundred fifty million, two hundred fifty-three thousand, six hundred sixty-one".