661111350 has 24 divisors (see below), whose sum is σ = 1639556520. Its totient is φ = 176296320.

The previous prime is 661111349. The next prime is 661111391. The reversal of 661111350 is 53111166.

It is a self number, because there is not a number n which added to its sum of digits gives 661111350.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2203555 + ... + 2203854.

It is an arithmetic number, because the mean of its divisors is an integer number (68314855).

Almost surely, 2^661111350 is an apocalyptic number.

661111350 is an abundant number, since it is smaller than the sum of its proper divisors (978445170).

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

661111350 is a wasteful number, since it uses less digits than its factorization.

661111350 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4407424 (or 4407419 counting only the distinct ones).

The product of its (nonzero) digits is 540, while the sum is 24.

The square root of 661111350 is about 25712.0856796955. The cubic root of 661111350 is about 871.1471852914.

The spelling of 661111350 in words is "six hundred sixty-one million, one hundred eleven thousand, three hundred fifty".