6642047747 has 16 divisors (see below), whose sum is σ = 7180669440. Its totient is φ = 6120985728.

The previous prime is 6642047719. The next prime is 6642047767. The reversal of 6642047747 is 7477402466.

It is not a de Polignac number, because 6642047747 - 2⁸ = 6642047491 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6642047767) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 172754 + ... + 207672.

It is an arithmetic number, because the mean of its divisors is an integer number (448791840).

Almost surely, 2^6642047747 is an apocalyptic number.

6642047747 is a gapful number since it is divisible by the number (67) formed by its first and last digit.

6642047747 is a deficient number, since it is larger than the sum of its proper divisors (538621693).

6642047747 is a wasteful number, since it uses less digits than its factorization.

6642047747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35170.

The product of its (nonzero) digits is 1580544, while the sum is 47.

The square root of 6642047747 is about 81498.7591746034. The cubic root of 6642047747 is about 1879.7524710888.

The spelling of 6642047747 in words is "six billion, six hundred forty-two million, forty-seven thousand, seven hundred forty-seven".