783899515161 has 135 divisors (see below), whose sum is σ = 1398531095871. Its totient is φ = 423027958752.

The previous prime is 783899515159. The next prime is 783899515181. The reversal of 783899515161 is 161515998387.

The square root of 783899515161 is 885381.

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

783899515161 is a `hidden beast` number, since 7 + 8 + 389 + 95 + 1 + 5 + 161 = 666.

It can be written as a sum of positive squares in only one way, i.e., 43879775625 + 740019739536 = 209475^2 + 860244^2 .

It is not a de Polignac number, because 783899515161 - 2¹ = 783899515159 is a prime.

It is a super-2 number, since 2×783899515161² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (783899515181) 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 in 134 ways as a sum of consecutive naturals, for example, 2472868975 + ... + 2472869291.

Almost surely, 2^783899515161 is an apocalyptic number.

783899515161 is the 885381-st square number.

783899515161 is the 442691-st centered octagonal number.

It is an amenable number.

783899515161 is a deficient number, since it is larger than the sum of its proper divisors (614631580710).

783899515161 is an frugal number, since it uses more digits than its factorization.

783899515161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 706 (or 346 counting only the distinct ones).

The product of its digits is 16329600, while the sum is 63.

The spelling of 783899515161 in words is "seven hundred eighty-three billion, eight hundred ninety-nine million, five hundred fifteen thousand, one hundred sixty-one".