661031606 has 8 divisors (see below), whose sum is σ = 997087320. Its totient is φ = 328669168.

The previous prime is 661031593. The next prime is 661031611. The reversal of 661031606 is 606130166.

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

It is a Curzon number.

It is a congruent number.

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, 922871 + ... + 923586.

It is an arithmetic number, because the mean of its divisors is an integer number (124635915).

Almost surely, 2^661031606 is an apocalyptic number.

661031606 is a deficient number, since it is larger than the sum of its proper divisors (336055714).

661031606 is a wasteful number, since it uses less digits than its factorization.

661031606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1846638.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 661031606 is about 25710.5349224788. The cubic root of 661031606 is about 871.1121576296.

The spelling of 661031606 in words is "six hundred sixty-one million, thirty-one thousand, six hundred six".