6507705661 has 4 divisors (see below), whose sum is σ = 6510753052. Its totient is φ = 6504658272.

The previous prime is 6507705649. The next prime is 6507705671. The reversal of 6507705661 is 1665077056.

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 1012448761 + 5495256900 = 31819^2 + 74130^2 .

It is a cyclic number.

It is not a de Polignac number, because 6507705661 - 2¹⁷ = 6507574589 is a prime.

It is a super-2 number, since 2×6507705661² = 84700465940422893842, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6507705641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1520490 + ... + 1524763.

It is an arithmetic number, because the mean of its divisors is an integer number (1627688263).

Almost surely, 2^6507705661 is an apocalyptic number.

It is an amenable number.

6507705661 is a deficient number, since it is larger than the sum of its proper divisors (3047391).

6507705661 is a wasteful number, since it uses less digits than its factorization.

6507705661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3047390.

The product of its (nonzero) digits is 264600, while the sum is 43.

The square root of 6507705661 is about 80670.3518090754. The cubic root of 6507705661 is about 1866.9927606571.

The spelling of 6507705661 in words is "six billion, five hundred seven million, seven hundred five thousand, six hundred sixty-one".