261345650 has 24 divisors (see below), whose sum is σ = 495279684. Its totient is φ = 102564800.

The previous prime is 261345647. The next prime is 261345653. The reversal of 261345650 is 56543162.

It is an interprime number because it is at equal distance from previous prime (261345647) and next prime (261345653).

It can be written as a sum of positive squares in 6 ways, for example, as 214710409 + 46635241 = 14653^2 + 6829^2 .

It is not an unprimeable number, because it can be changed into a prime (261345653) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 46661 + ... + 51960.

Almost surely, 2^261345650 is an apocalyptic number.

261345650 is a deficient number, since it is larger than the sum of its proper divisors (233934034).

261345650 is a wasteful number, since it uses less digits than its factorization.

261345650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98686 (or 98681 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 32.

The square root of 261345650 is about 16166.1884809005. The cubic root of 261345650 is about 639.3496404438.

The spelling of 261345650 in words is "two hundred sixty-one million, three hundred forty-five thousand, six hundred fifty".