6493961665 has 8 divisors (see below), whose sum is σ = 8251151400. Its totient is φ = 4889571072.

The previous prime is 6493961651. The next prime is 6493961671. The reversal of 6493961665 is 5661693946.

It can be written as a sum of positive squares in 4 ways, for example, as 125283249 + 6368678416 = 11193^2 + 79804^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6493961665 - 2¹⁷ = 6493830593 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38199690 + ... + 38199859.

It is an arithmetic number, because the mean of its divisors is an integer number (1031393925).

Almost surely, 2^6493961665 is an apocalyptic number.

It is an amenable number.

6493961665 is a deficient number, since it is larger than the sum of its proper divisors (1757189735).

6493961665 is a wasteful number, since it uses less digits than its factorization.

6493961665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76399571.

The product of its digits is 6298560, while the sum is 55.

The square root of 6493961665 is about 80585.1206178907. The cubic root of 6493961665 is about 1865.6774980116.

The spelling of 6493961665 in words is "six billion, four hundred ninety-three million, nine hundred sixty-one thousand, six hundred sixty-five".