661652522 has 8 divisors (see below), whose sum is σ = 1003630500. Its totient is φ = 327109024.

The previous prime is 661652521. The next prime is 661652549. The reversal of 661652522 is 225256166.

It can be written as a sum of positive squares in 2 ways, for example, as 622951681 + 38700841 = 24959^2 + 6221^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (661652521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1858397 + ... + 1858752.

Almost surely, 2^661652522 is an apocalyptic number.

661652522 is a deficient number, since it is larger than the sum of its proper divisors (341977978).

661652522 is a wasteful number, since it uses less digits than its factorization.

661652522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3717240.

The product of its digits is 43200, while the sum is 35.

The square root of 661652522 is about 25722.6072162213. The cubic root of 661652522 is about 871.3848214506.

The spelling of 661652522 in words is "six hundred sixty-one million, six hundred fifty-two thousand, five hundred twenty-two".