768366755661 has 4 divisors (see below), whose sum is σ = 1024489007552. Its totient is φ = 512244503772.

The previous prime is 768366755647. The next prime is 768366755669. The reversal of 768366755661 is 166557663867.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 768366755661 - 2¹³ = 768366747469 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 768366755592 and 768366755601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (768366755669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 128061125941 + ... + 128061125946.

It is an arithmetic number, because the mean of its divisors is an integer number (256122251888).

Almost surely, 2^768366755661 is an apocalyptic number.

It is an amenable number.

768366755661 is a deficient number, since it is larger than the sum of its proper divisors (256122251891).

768366755661 is a wasteful number, since it uses less digits than its factorization.

768366755661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256122251890.

The product of its digits is 228614400, while the sum is 66.

The spelling of 768366755661 in words is "seven hundred sixty-eight billion, three hundred sixty-six million, seven hundred fifty-five thousand, six hundred sixty-one".