661776050 has 48 divisors (see below), whose sum is σ = 1334680200. Its totient is φ = 242672640.

The previous prime is 661776013. The next prime is 661776053. The reversal of 661776050 is 50677166.

It can be written as a sum of positive squares in 12 ways, for example, as 88604569 + 573171481 = 9413^2 + 23941^2 .

It is a junction number, because it is equal to n+sod(n) for n = 661775995 and 661776013.

It is not an unprimeable number, because it can be changed into a prime (661776053) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 93434 + ... + 100266.

Almost surely, 2^661776050 is an apocalyptic number.

661776050 is an abundant number, since it is smaller than the sum of its proper divisors (672904150).

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

661776050 is a wasteful number, since it uses less digits than its factorization.

661776050 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7007 (or 7002 counting only the distinct ones).

The product of its (nonzero) digits is 52920, while the sum is 38.

The square root of 661776050 is about 25725.0082604457. The cubic root of 661776050 is about 871.4390461494.

It can be divided in two parts, 66177 and 6050, that added together give a palindrome (72227).

The spelling of 661776050 in words is "six hundred sixty-one million, seven hundred seventy-six thousand, fifty".