780938061849 has 81 divisors (see below), whose sum is σ = 1263428820927. Its totient is φ = 464476399200.

The previous prime is 780938061847. The next prime is 780938061857. The reversal of 780938061849 is 948160839087.

The square root of 780938061849 is 883707.

It is a perfect power (a square), and thus also a powerful number.

780938061849 is a `hidden beast` number, since 7 + 8 + 0 + 9 + 3 + 8 + 0 + 618 + 4 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 25394653449 + 755543408400 = 159357^2 + 869220^2 .

It is not a de Polignac number, because 780938061849 - 2¹ = 780938061847 is a prime.

It is not an unprimeable number, because it can be changed into a prime (780938061847) by changing a digit.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 1778901972 + ... + 1778902410.

Almost surely, 2^780938061849 is an apocalyptic number.

780938061849 is the 883707-th square number.

780938061849 is the 441854-th centered octagonal number.

It is an amenable number.

780938061849 is a deficient number, since it is larger than the sum of its proper divisors (482490759078).

780938061849 is an equidigital number, since it uses as much as digits as its factorization.

780938061849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1028 (or 514 counting only the distinct ones).

The product of its (nonzero) digits is 20901888, while the sum is 63.

The spelling of 780938061849 in words is "seven hundred eighty billion, nine hundred thirty-eight million, sixty-one thousand, eight hundred forty-nine".