6660491949 has 16 divisors (see below), whose sum is σ = 10185699840. Its totient is φ = 4297091040.

The previous prime is 6660491947. The next prime is 6660491969. The reversal of 6660491949 is 9491940666.

It is not a de Polignac number, because 6660491949 - 2¹ = 6660491947 is a prime.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 6660491895 and 6660491904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6660491941) 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 15 ways as a sum of consecutive naturals, for example, 3977952 + ... + 3979625.

It is an arithmetic number, because the mean of its divisors is an integer number (636606240).

Almost surely, 2^6660491949 is an apocalyptic number.

It is an amenable number.

6660491949 is a deficient number, since it is larger than the sum of its proper divisors (3525207891).

6660491949 is a wasteful number, since it uses less digits than its factorization.

6660491949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7957617 (or 7957611 counting only the distinct ones).

The product of its (nonzero) digits is 2519424, while the sum is 54.

The square root of 6660491949 is about 81611.8370642396. The cubic root of 6660491949 is about 1881.4908150954.

The spelling of 6660491949 in words is "six billion, six hundred sixty million, four hundred ninety-one thousand, nine hundred forty-nine".