780494768649 has 6 divisors (see below), whose sum is σ = 1127381332506. Its totient is φ = 520329845760.

The previous prime is 780494768597. The next prime is 780494768689. The reversal of 780494768649 is 946867494087.

780494768649 is a `hidden beast` number, since 7 + 8 + 0 + 494 + 76 + 8 + 64 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 539960432400 + 240534336249 = 734820^2 + 490443^2 .

It is a de Polignac number, because none of the positive numbers 2^k-780494768649 is a prime.

It is not an unprimeable number, because it can be changed into a prime (780494768689) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 43360820472 + ... + 43360820489.

It is an arithmetic number, because the mean of its divisors is an integer number (187896888751).

Almost surely, 2^780494768649 is an apocalyptic number.

It is an amenable number.

780494768649 is a deficient number, since it is larger than the sum of its proper divisors (346886563857).

780494768649 is a wasteful number, since it uses less digits than its factorization.

780494768649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86721640967 (or 86721640964 counting only the distinct ones).

The product of its (nonzero) digits is 585252864, while the sum is 72.

It can be divided in two parts, 7 and 80494768649, that added together give a square (80494768656 = 283716²).

The spelling of 780494768649 in words is "seven hundred eighty billion, four hundred ninety-four million, seven hundred sixty-eight thousand, six hundred forty-nine".