6406910661 has 4 divisors (see below), whose sum is σ = 8542547552. Its totient is φ = 4271273772.

The previous prime is 6406910641. The next prime is 6406910681. The reversal of 6406910661 is 1660196046.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (6406910641) and next prime (6406910681).

It is not a de Polignac number, because 6406910661 - 2⁶ = 6406910597 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 (6406910611) 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, 1067818441 + ... + 1067818446.

It is an arithmetic number, because the mean of its divisors is an integer number (2135636888).

Almost surely, 2^6406910661 is an apocalyptic number.

It is an amenable number.

6406910661 is a deficient number, since it is larger than the sum of its proper divisors (2135636891).

6406910661 is a wasteful number, since it uses less digits than its factorization.

6406910661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2135636890.

The product of its (nonzero) digits is 46656, while the sum is 39.

The square root of 6406910661 is about 80043.1799780593. The cubic root of 6406910661 is about 1857.3035523736.

The spelling of 6406910661 in words is "six billion, four hundred six million, nine hundred ten thousand, six hundred sixty-one".