6649743957 has 8 divisors (see below), whose sum is σ = 9082577280. Its totient is φ = 4325036640.

The previous prime is 6649743941. The next prime is 6649743973. The reversal of 6649743957 is 7593479466.

It is an interprime number because it is at equal distance from previous prime (6649743941) and next prime (6649743973).

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

It is not a de Polignac number, because 6649743957 - 2⁴ = 6649743941 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6649743957.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6649744957) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27031357 + ... + 27031602.

It is an arithmetic number, because the mean of its divisors is an integer number (1135322160).

Almost surely, 2^6649743957 is an apocalyptic number.

It is an amenable number.

6649743957 is a deficient number, since it is larger than the sum of its proper divisors (2432833323).

6649743957 is a wasteful number, since it uses less digits than its factorization.

6649743957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54063003.

The product of its digits is 34292160, while the sum is 60.

The square root of 6649743957 is about 81545.9622360298. The cubic root of 6649743957 is about 1880.4782204478.

The spelling of 6649743957 in words is "six billion, six hundred forty-nine million, seven hundred forty-three thousand, nine hundred fifty-seven".