6640768743 has 16 divisors (see below), whose sum is σ = 10121354496. Its totient is φ = 3793942080.

The previous prime is 6640768741. The next prime is 6640768753. The reversal of 6640768743 is 3478670466.

It is not a de Polignac number, because 6640768743 - 2¹ = 6640768741 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6640768741) 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, 80748 + ... + 140718.

It is an arithmetic number, because the mean of its divisors is an integer number (632584656).

Almost surely, 2^6640768743 is an apocalyptic number.

6640768743 is a deficient number, since it is larger than the sum of its proper divisors (3480585753).

6640768743 is a wasteful number, since it uses less digits than its factorization.

6640768743 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65254.

The product of its (nonzero) digits is 4064256, while the sum is 51.

The square root of 6640768743 is about 81490.9120270475. The cubic root of 6640768743 is about 1879.6318072335.

The spelling of 6640768743 in words is "six billion, six hundred forty million, seven hundred sixty-eight thousand, seven hundred forty-three".