240515661 has 8 divisors (see below), whose sum is σ = 337565920. Its totient is φ = 151904592.

The previous prime is 240515659. The next prime is 240515689. The reversal of 240515661 is 166515042.

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

It is not a de Polignac number, because 240515661 - 2¹ = 240515659 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (240515621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2109730 + ... + 2109843.

It is an arithmetic number, because the mean of its divisors is an integer number (42195740).

Almost surely, 2^240515661 is an apocalyptic number.

It is an amenable number.

240515661 is a deficient number, since it is larger than the sum of its proper divisors (97050259).

240515661 is a wasteful number, since it uses less digits than its factorization.

240515661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4219595.

The product of its (nonzero) digits is 7200, while the sum is 30.

The square root of 240515661 is about 15508.5673419565. The cubic root of 240515661 is about 621.8912602029.

The spelling of 240515661 in words is "two hundred forty million, five hundred fifteen thousand, six hundred sixty-one".