661220082 has 12 divisors (see below), whose sum is σ = 1432643550. Its totient is φ = 220406688.

The previous prime is 661220069. The next prime is 661220099. The reversal of 661220082 is 280022166.

It can be written as a sum of positive squares in only one way, i.e., 423166041 + 238054041 = 20571^2 + 15429^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 18367207 + ... + 18367242.

Almost surely, 2^661220082 is an apocalyptic number.

661220082 is an abundant number, since it is smaller than the sum of its proper divisors (771423468).

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

661220082 is a wasteful number, since it uses less digits than its factorization.

661220082 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36734457 (or 36734454 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 661220082 is about 25714.2000070000. The cubic root of 661220082 is about 871.1949414338.

The spelling of 661220082 in words is "six hundred sixty-one million, two hundred twenty thousand, eighty-two".