756648161 has 4 divisors (see below), whose sum is σ = 759895812. Its totient is φ = 753400512.

The previous prime is 756648133. The next prime is 756648163. The reversal of 756648161 is 161846657.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 167857936 + 588790225 = 12956^2 + 24265^2 .

It is a cyclic number.

It is not a de Polignac number, because 756648161 - 2¹⁸ = 756386017 is a prime.

It is a super-3 number, since 3×756648161³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (756648163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1623476 + ... + 1623941.

It is an arithmetic number, because the mean of its divisors is an integer number (189973953).

Almost surely, 2^756648161 is an apocalyptic number.

It is an amenable number.

756648161 is a deficient number, since it is larger than the sum of its proper divisors (3247651).

756648161 is a wasteful number, since it uses less digits than its factorization.

756648161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3247650.

The product of its digits is 241920, while the sum is 44.

The square root of 756648161 is about 27507.2383382992. The cubic root of 756648161 is about 911.2369609185.

The spelling of 756648161 in words is "seven hundred fifty-six million, six hundred forty-eight thousand, one hundred sixty-one".