261662115 has 64 divisors (see below), whose sum is σ = 495129600. Its totient is φ = 116328960.

The previous prime is 261662101. The next prime is 261662117. The reversal of 261662115 is 511266162.

It is not a de Polignac number, because 261662115 - 2⁸ = 261661859 is a prime.

It is not an unprimeable number, because it can be changed into a prime (261662117) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 426549 + ... + 427161.

It is an arithmetic number, because the mean of its divisors is an integer number (7736400).

Almost surely, 2^261662115 is an apocalyptic number.

261662115 is a deficient number, since it is larger than the sum of its proper divisors (233467485).

261662115 is a wasteful number, since it uses less digits than its factorization.

261662115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 844.

The product of its digits is 4320, while the sum is 30.

The square root of 261662115 is about 16175.9733864766. The cubic root of 261662115 is about 639.6076004425.

The spelling of 261662115 in words is "two hundred sixty-one million, six hundred sixty-two thousand, one hundred fifteen".