869755816449 has 63 divisors (see below), whose sum is σ = 1412595583833. Its totient is φ = 535032905472.

The previous prime is 869755816439. The next prime is 869755816469. The reversal of 869755816449 is 944618557968.

The square root of 869755816449 is 932607.

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

869755816449 is a `hidden beast` number, since 8 + 6 + 9 + 7 + 558 + 1 + 64 + 4 + 9 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 47723460849 + 822032355600 = 218457^2 + 906660^2 .

It is not a de Polignac number, because 869755816449 - 2⁹ = 869755815937 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (869755816439) by changing a digit.

It is a polite number, since it can be written in 62 ways as a sum of consecutive naturals, for example, 327343729 + ... + 327346385.

Almost surely, 2^869755816449 is an apocalyptic number.

869755816449 is the 932607-th square number.

869755816449 is the 466304-th centered octagonal number.

It is an amenable number.

869755816449 is a deficient number, since it is larger than the sum of its proper divisors (542839767384).

869755816449 is an frugal number, since it uses more digits than its factorization.

869755816449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5358 (or 2673 counting only the distinct ones).

The product of its digits is 522547200, while the sum is 72.

The spelling of 869755816449 in words is "eight hundred sixty-nine billion, seven hundred fifty-five million, eight hundred sixteen thousand, four hundred forty-nine".