661033030 has 48 divisors (see below), whose sum is σ = 1390759200. Its totient is φ = 226123632.

The previous prime is 661033001. The next prime is 661033069. The reversal of 661033030 is 30330166.

It is a happy number.

It is a zygodrome in base 7.

It is a junction number, because it is equal to n+sod(n) for n = 661032992 and 661033010.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1505551 + ... + 1505989.

It is an arithmetic number, because the mean of its divisors is an integer number (28974150).

Almost surely, 2^661033030 is an apocalyptic number.

661033030 is an abundant number, since it is smaller than the sum of its proper divisors (729726170).

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

661033030 is an frugal number, since it uses more digits than its factorization.

661033030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 906 (or 453 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 22.

The square root of 661033030 is about 25710.5626153921. The cubic root of 661033030 is about 871.1127831482.

Adding to 661033030 its reverse (30330166), we get a palindrome (691363196).

The spelling of 661033030 in words is "six hundred sixty-one million, thirty-three thousand, thirty".