7643768616658 has 4 divisors (see below), whose sum is σ = 11465652924990. Its totient is φ = 3821884308328.

The previous prime is 7643768616641. The next prime is 7643768616677. The reversal of 7643768616658 is 8566168673467.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 6017243342049 + 1626525274609 = 2453007^2 + 1275353^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1910942154163 + ... + 1910942154166.

Almost surely, 2^{7643768616658} is an apocalyptic number.

7643768616658 is a deficient number, since it is larger than the sum of its proper divisors (3821884308332).

7643768616658 is a wasteful number, since it uses less digits than its factorization.

7643768616658 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3821884308331.

The product of its digits is 1463132160, while the sum is 73.

The spelling of 7643768616658 in words is "seven trillion, six hundred forty-three billion, seven hundred sixty-eight million, six hundred sixteen thousand, six hundred fifty-eight".