661710522 has 48 divisors (see below), whose sum is σ = 1468958400. Its totient is φ = 198549120.

The previous prime is 661710503. The next prime is 661710541. The reversal of 661710522 is 225017166.

It is an interprime number because it is at equal distance from previous prime (661710503) and next prime (661710541).

It is a self number, because there is not a number n which added to its sum of digits gives 661710522.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 70354 + ... + 79202.

It is an arithmetic number, because the mean of its divisors is an integer number (30603300).

Almost surely, 2^661710522 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 661710522, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (734479200).

661710522 is an abundant number, since it is smaller than the sum of its proper divisors (807247878).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

661710522 is a wasteful number, since it uses less digits than its factorization.

661710522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8979 (or 8968 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 30.

The square root of 661710522 is about 25723.7346044465. The cubic root of 661710522 is about 871.4102823691.

Adding to 661710522 its reverse (225017166), we get a palindrome (886727688).

The spelling of 661710522 in words is "six hundred sixty-one million, seven hundred ten thousand, five hundred twenty-two".