6634649861 has 16 divisors (see below), whose sum is σ = 7761836544. Its totient is φ = 5552872704.

The previous prime is 6634649831. The next prime is 6634649863. The reversal of 6634649861 is 1689464366.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 6634649861 - 2¹⁴ = 6634633477 is a prime.

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6634649863) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 119171 + ... + 165743.

It is an arithmetic number, because the mean of its divisors is an integer number (485114784).

Almost surely, 2^6634649861 is an apocalyptic number.

It is an amenable number.

6634649861 is a deficient number, since it is larger than the sum of its proper divisors (1127186683).

6634649861 is a wasteful number, since it uses less digits than its factorization.

6634649861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47060.

The product of its digits is 4478976, while the sum is 53.

The square root of 6634649861 is about 81453.3600350532. The cubic root of 6634649861 is about 1879.0543249195.

The spelling of 6634649861 in words is "six billion, six hundred thirty-four million, six hundred forty-nine thousand, eight hundred sixty-one".