661116522 has 16 divisors (see below), whose sum is σ = 1442436192. Its totient is φ = 200338320.

The previous prime is 661116517. The next prime is 661116539. The reversal of 661116522 is 225611166.

It is a super-2 number, since 2×661116522² = 874150111322752968, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 661116522.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5008393 + ... + 5008524.

It is an arithmetic number, because the mean of its divisors is an integer number (90152262).

Almost surely, 2^661116522 is an apocalyptic number.

661116522 is an abundant number, since it is smaller than the sum of its proper divisors (781319670).

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

661116522 is a wasteful number, since it uses less digits than its factorization.

661116522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10016933.

The product of its digits is 4320, while the sum is 30.

The square root of 661116522 is about 25712.1862547703. The cubic root of 661116522 is about 871.1494570023.

Adding to 661116522 its reverse (225611166), we get a palindrome (886727688).

The spelling of 661116522 in words is "six hundred sixty-one million, one hundred sixteen thousand, five hundred twenty-two".