863148661 has 2 divisors, whose sum is σ = 863148662. Its totient is φ = 863148660.

The previous prime is 863148647. The next prime is 863148677. The reversal of 863148661 is 166841368.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 686125636 + 177023025 = 26194^2 + 13305^2 .

It is a cyclic number.

It is not a de Polignac number, because 863148661 - 2²⁷ = 728930933 is a prime.

It is a super-2 number, since 2×863148661² = 1490051221972185842, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (863148631) 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 as a sum of consecutive naturals, namely, 431574330 + 431574331.

It is an arithmetic number, because the mean of its divisors is an integer number (431574331).

Almost surely, 2^863148661 is an apocalyptic number.

It is an amenable number.

863148661 is a deficient number, since it is larger than the sum of its proper divisors (1).

863148661 is an equidigital number, since it uses as much as digits as its factorization.

863148661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 165888, while the sum is 43.

The square root of 863148661 is about 29379.3917738268. The cubic root of 863148661 is about 952.1277005008.

The spelling of 863148661 in words is "eight hundred sixty-three million, one hundred forty-eight thousand, six hundred sixty-one".