661885914 has 8 divisors (see below), whose sum is σ = 1323771840. Its totient is φ = 220628636.

The previous prime is 661885897. The next prime is 661885949. The reversal of 661885914 is 419588166.

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

661885914 is an admirable 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, 55157154 + ... + 55157165.

It is an arithmetic number, because the mean of its divisors is an integer number (165471480).

Almost surely, 2^661885914 is an apocalyptic number.

661885914 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

661885914 is a wasteful number, since it uses less digits than its factorization.

661885914 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110314324.

The product of its digits is 414720, while the sum is 48.

The square root of 661885914 is about 25727.1435258561. The cubic root of 661885914 is about 871.4872671359.

The spelling of 661885914 in words is "six hundred sixty-one million, eight hundred eighty-five thousand, nine hundred fourteen".