240740520681 has 4 divisors (see below), whose sum is σ = 320987360912. Its totient is φ = 160493680452.

The previous prime is 240740520659. The next prime is 240740520773. The reversal of 240740520681 is 186025047042.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 240740520681 - 2¹⁷ = 240740389609 is a prime.

It is a super-2 number, since 2×240740520681² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (240740520641) 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, 40123420111 + ... + 40123420116.

It is an arithmetic number, because the mean of its divisors is an integer number (80246840228).

Almost surely, 2^240740520681 is an apocalyptic number.

It is an amenable number.

240740520681 is a deficient number, since it is larger than the sum of its proper divisors (80246840231).

240740520681 is an equidigital number, since it uses as much as digits as its factorization.

240740520681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80246840230.

The product of its (nonzero) digits is 107520, while the sum is 39.

The spelling of 240740520681 in words is "two hundred forty billion, seven hundred forty million, five hundred twenty thousand, six hundred eighty-one".