661671006 has 32 divisors (see below), whose sum is σ = 1368960000. Its totient is φ = 212984640.

The previous prime is 661670951. The next prime is 661671007. The reversal of 661671006 is 600176166.

661671006 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661671007) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 89250 + ... + 96378.

It is an arithmetic number, because the mean of its divisors is an integer number (42780000).

Almost surely, 2^661671006 is an apocalyptic number.

661671006 is an abundant number, since it is smaller than the sum of its proper divisors (707288994).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

661671006 is a wasteful number, since it uses less digits than its factorization.

661671006 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7664.

The product of its (nonzero) digits is 9072, while the sum is 33.

The square root of 661671006 is about 25722.9665085503. The cubic root of 661671006 is about 871.3929357435.

The spelling of 661671006 in words is "six hundred sixty-one million, six hundred seventy-one thousand, six".