661005106 has 8 divisors (see below), whose sum is σ = 992286720. Its totient is φ = 330242868.

The previous prime is 661005097. The next prime is 661005109. The reversal of 661005106 is 601500166.

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

It is not an unprimeable number, because it can be changed into a prime (661005109) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 126646 + ... + 131761.

It is an arithmetic number, because the mean of its divisors is an integer number (124035840).

Almost surely, 2^661005106 is an apocalyptic number.

661005106 is a deficient number, since it is larger than the sum of its proper divisors (331281614).

661005106 is a wasteful number, since it uses less digits than its factorization.

661005106 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259688.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 661005106 is about 25710.0195643644. The cubic root of 661005106 is about 871.1005168445.

The spelling of 661005106 in words is "six hundred sixty-one million, five thousand, one hundred six".