661565050 has 24 divisors (see below), whose sum is σ = 1231216956. Its totient is φ = 264474240.

The previous prime is 661565041. The next prime is 661565059. The reversal of 661565050 is 50565166.

It is an interprime number because it is at equal distance from previous prime (661565041) and next prime (661565059).

It can be written as a sum of positive squares in 6 ways, for example, as 381772521 + 279792529 = 19539^2 + 16727^2 .

It is a junction number, because it is equal to n+sod(n) for n = 661564997 and 661565015.

It is not an unprimeable number, because it can be changed into a prime (661565059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 133212 + ... + 138088.

Almost surely, 2^661565050 is an apocalyptic number.

661565050 is a deficient number, since it is larger than the sum of its proper divisors (569651906).

661565050 is a wasteful number, since it uses less digits than its factorization.

661565050 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7602 (or 7597 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 34.

The square root of 661565050 is about 25720.9068658164. The cubic root of 661565050 is about 871.3464200593.

The spelling of 661565050 in words is "six hundred sixty-one million, five hundred sixty-five thousand, fifty".