6219570661 has 4 divisors (see below), whose sum is σ = 6220608300. Its totient is φ = 6218533024.

The previous prime is 6219570631. The next prime is 6219570673. The reversal of 6219570661 is 1660759126.

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 5720048161 + 499522500 = 75631^2 + 22350^2 .

It is a cyclic number.

It is not a de Polignac number, because 6219570661 - 2¹³ = 6219562469 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 (6219570601) 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, 509776 + ... + 521833.

It is an arithmetic number, because the mean of its divisors is an integer number (1555152075).

Almost surely, 2^6219570661 is an apocalyptic number.

It is an amenable number.

6219570661 is a deficient number, since it is larger than the sum of its proper divisors (1037639).

6219570661 is a wasteful number, since it uses less digits than its factorization.

6219570661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1037638.

The product of its (nonzero) digits is 136080, while the sum is 43.

The square root of 6219570661 is about 78864.2546468297. The cubic root of 6219570661 is about 1839.0214808343.

The spelling of 6219570661 in words is "six billion, two hundred nineteen million, five hundred seventy thousand, six hundred sixty-one".