776681161 has 15 divisors (see below), whose sum is σ = 831199655. Its totient is φ = 725708760.

The previous prime is 776681117. The next prime is 776681167. The reversal of 776681161 is 161186677.

The square root of 776681161 is 27869.

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

It can be written as a sum of positive squares in only one way, i.e., 407272761 + 369408400 = 20181^2 + 19220^2 .

It is not a de Polignac number, because 776681161 - 2¹⁵ = 776648393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (776681167) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 25054216 + ... + 25054246.

Almost surely, 2^776681161 is an apocalyptic number.

776681161 is the 27869-th square number.

776681161 is the 13935-th centered octagonal number.

It is an amenable number.

776681161 is a deficient number, since it is larger than the sum of its proper divisors (54518494).

776681161 is an frugal number, since it uses more digits than its factorization.

776681161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182 (or 60 counting only the distinct ones).

The product of its digits is 84672, while the sum is 43.

The cubic root of 776681161 is about 919.2089770460.

The spelling of 776681161 in words is "seven hundred seventy-six million, six hundred eighty-one thousand, one hundred sixty-one".