661100386 has 16 divisors (see below), whose sum is σ = 1078362936. Its totient is φ = 302697216.

The previous prime is 661100357. The next prime is 661100387. The reversal of 661100386 is 683001166.

It can be written as a sum of positive squares in 4 ways, for example, as 642876025 + 18224361 = 25355^2 + 4269^2 .

It is not an unprimeable number, because it can be changed into a prime (661100387) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 261501 + ... + 264016.

Almost surely, 2^661100386 is an apocalyptic number.

661100386 is a deficient number, since it is larger than the sum of its proper divisors (417262550).

661100386 is a wasteful number, since it uses less digits than its factorization.

661100386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 525573.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 661100386 is about 25711.8724716812. The cubic root of 661100386 is about 871.1423695064.

The spelling of 661100386 in words is "six hundred sixty-one million, one hundred thousand, three hundred eighty-six".