661122075 has 18 divisors (see below), whose sum is σ = 1093423444. Its totient is φ = 352479680.

The previous prime is 661122071. The next prime is 661122101. The reversal of 661122075 is 570221166.

It is not a de Polignac number, because 661122075 - 2² = 661122071 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (661122071) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 221191 + ... + 224159.

Almost surely, 2^661122075 is an apocalyptic number.

661122075 is a deficient number, since it is larger than the sum of its proper divisors (432301369).

661122075 is an frugal number, since it uses more digits than its factorization.

661122075 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5951 (or 2977 counting only the distinct ones).

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

The square root of 661122075 is about 25712.2942383600. The cubic root of 661122075 is about 871.1518960476.

Subtracting from 661122075 its reverse (570221166), we obtain a palindrome (90900909).

The spelling of 661122075 in words is "six hundred sixty-one million, one hundred twenty-two thousand, seventy-five".