661611106 has 8 divisors (see below), whose sum is σ = 1068756444. Its totient is φ = 305358960.

The previous prime is 661611091. The next prime is 661611161. The reversal of 661611106 is 601116166.

It can be written as a sum of positive squares in 2 ways, for example, as 564490081 + 97121025 = 23759^2 + 9855^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12723265 + ... + 12723316.

Almost surely, 2^661611106 is an apocalyptic number.

661611106 is a deficient number, since it is larger than the sum of its proper divisors (407145338).

661611106 is a wasteful number, since it uses less digits than its factorization.

661611106 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25446596.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 661611106 is about 25721.8021530374. The cubic root of 661611106 is about 871.3666396882.

The spelling of 661611106 in words is "six hundred sixty-one million, six hundred eleven thousand, one hundred six".