661206052 has 12 divisors (see below), whose sum is σ = 1246119196. Its totient is φ = 305172000.

The previous prime is 661206043. The next prime is 661206059. The reversal of 661206052 is 250602166.

It can be written as a sum of positive squares in 2 ways, for example, as 32901696 + 628304356 = 5736^2 + 25066^2 .

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 661206052.

It is not an unprimeable number, because it can be changed into a prime (661206059) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 6357699 + ... + 6357802.

Almost surely, 2^661206052 is an apocalyptic number.

It is an amenable number.

661206052 is a deficient number, since it is larger than the sum of its proper divisors (584913144).

661206052 is a wasteful number, since it uses less digits than its factorization.

661206052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12715518 (or 12715516 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 661206052 is about 25713.9271990880. The cubic root of 661206052 is about 871.1887796168.

The spelling of 661206052 in words is "six hundred sixty-one million, two hundred six thousand, fifty-two".