240057809861 has 4 divisors (see below), whose sum is σ = 242182215372. Its totient is φ = 237933404352.

The previous prime is 240057809851. The next prime is 240057809869. The reversal of 240057809861 is 168908750042.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 89751172225 + 150306637636 = 299585^2 + 387694^2 .

It is a cyclic number.

It is not a de Polignac number, because 240057809861 - 2²⁶ = 239990700997 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (240057809869) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1062202586 + ... + 1062202811.

It is an arithmetic number, because the mean of its divisors is an integer number (60545553843).

Almost surely, 2^240057809861 is an apocalyptic number.

It is an amenable number.

240057809861 is a deficient number, since it is larger than the sum of its proper divisors (2124405511).

240057809861 is a wasteful number, since it uses less digits than its factorization.

240057809861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2124405510.

The product of its (nonzero) digits is 967680, while the sum is 50.

The spelling of 240057809861 in words is "two hundred forty billion, fifty-seven million, eight hundred nine thousand, eight hundred sixty-one".