240855661 has 2 divisors, whose sum is σ = 240855662. Its totient is φ = 240855660.

The previous prime is 240855623. The next prime is 240855679. The reversal of 240855661 is 166558042.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 170798761 + 70056900 = 13069^2 + 8370^2 .

It is a cyclic number.

It is not a de Polignac number, because 240855661 - 2¹⁵ = 240822893 is a prime.

It is a super-2 number, since 2×240855661² = 116022898871493842, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 240855661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (240855961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 120427830 + 120427831.

It is an arithmetic number, because the mean of its divisors is an integer number (120427831).

Almost surely, 2^240855661 is an apocalyptic number.

It is an amenable number.

240855661 is a deficient number, since it is larger than the sum of its proper divisors (1).

240855661 is an equidigital number, since it uses as much as digits as its factorization.

240855661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 57600, while the sum is 37.

The square root of 240855661 is about 15519.5251538183. The cubic root of 240855661 is about 622.1841634755.

The spelling of 240855661 in words is "two hundred forty million, eight hundred fifty-five thousand, six hundred sixty-one".