766137639361 has 4 divisors (see below), whose sum is σ = 768332876500. Its totient is φ = 763942402224.

The previous prime is 766137639359. The next prime is 766137639383. The reversal of 766137639361 is 163936731667.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 163936731667 = 139291 ⋅1176937.

It can be written as a sum of positive squares in 2 ways, for example, as 220247183025 + 545890456336 = 469305^2 + 738844^2 .

It is a cyclic number.

It is not a de Polignac number, because 766137639361 - 2¹ = 766137639359 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 766137639296 and 766137639305.

It is not an unprimeable number, because it can be changed into a prime (766137639161) 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 3 ways as a sum of consecutive naturals, for example, 1097618046 + ... + 1097618743.

It is an arithmetic number, because the mean of its divisors is an integer number (192083219125).

Almost surely, 2^766137639361 is an apocalyptic number.

It is an amenable number.

766137639361 is a deficient number, since it is larger than the sum of its proper divisors (2195237139).

766137639361 is a wasteful number, since it uses less digits than its factorization.

766137639361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2195237138.

The product of its digits is 15431472, while the sum is 58.

The spelling of 766137639361 in words is "seven hundred sixty-six billion, one hundred thirty-seven million, six hundred thirty-nine thousand, three hundred sixty-one".