261640202 has 8 divisors (see below), whose sum is σ = 393909312. Its totient is φ = 130337100.

The previous prime is 261640201. The next prime is 261640213. The reversal of 261640202 is 202046162.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (261640201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 240824 + ... + 241907.

It is an arithmetic number, because the mean of its divisors is an integer number (49238664).

Almost surely, 2^261640202 is an apocalyptic number.

261640202 is a deficient number, since it is larger than the sum of its proper divisors (132269110).

261640202 is a wasteful number, since it uses less digits than its factorization.

261640202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 483004.

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 261640202 is about 16175.2960405675. The cubic root of 261640202 is about 639.5897452114.

Adding to 261640202 its reverse (202046162), we get a palindrome (463686364).

The spelling of 261640202 in words is "two hundred sixty-one million, six hundred forty thousand, two hundred two".