766255607617 has 4 divisors (see below), whose sum is σ = 766257752260. Its totient is φ = 766253462976.

The previous prime is 766255607603. The next prime is 766255607653. The reversal of 766255607617 is 716706552667.

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

It can be written as a sum of positive squares in 2 ways, for example, as 663938150976 + 102317456641 = 814824^2 + 319871^2 .

It is a cyclic number.

It is not a de Polignac number, because 766255607617 - 2²³ = 766247219009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (766255607657) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 392892 + ... + 1298797.

It is an arithmetic number, because the mean of its divisors is an integer number (191564438065).

Almost surely, 2^766255607617 is an apocalyptic number.

It is an amenable number.

766255607617 is a deficient number, since it is larger than the sum of its proper divisors (2144643).

766255607617 is a wasteful number, since it uses less digits than its factorization.

766255607617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2144642.

The product of its (nonzero) digits is 22226400, while the sum is 58.

The spelling of 766255607617 in words is "seven hundred sixty-six billion, two hundred fifty-five million, six hundred seven thousand, six hundred seventeen".