661732206 has 32 divisors (see below), whose sum is σ = 1332979200. Its totient is φ = 218998080.

The previous prime is 661732193. The next prime is 661732219. The reversal of 661732206 is 602237166.

It is an interprime number because it is at equal distance from previous prime (661732193) and next prime (661732219).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 815541 + ... + 816351.

It is an arithmetic number, because the mean of its divisors is an integer number (41655600).

Almost surely, 2^661732206 is an apocalyptic number.

661732206 is an abundant number, since it is smaller than the sum of its proper divisors (671246994).

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

661732206 is a wasteful number, since it uses less digits than its factorization.

661732206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1624.

The product of its (nonzero) digits is 18144, while the sum is 33.

The square root of 661732206 is about 25724.1560794519. The cubic root of 661732206 is about 871.4198008587.

The spelling of 661732206 in words is "six hundred sixty-one million, seven hundred thirty-two thousand, two hundred six".