661514242438 has 24 divisors (see below), whose sum is σ = 1182427903944. Its totient is φ = 276591319200.

The previous prime is 661514242373. The next prime is 661514242457. The reversal of 661514242438 is 834242415166.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 82314828 + ... + 82322863.

It is an arithmetic number, because the mean of its divisors is an integer number (49267829331).

Almost surely, 2^661514242438 is an apocalyptic number.

661514242438 is a deficient number, since it is larger than the sum of its proper divisors (520913661506).

661514242438 is a wasteful number, since it uses less digits than its factorization.

661514242438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164637748 (or 164637741 counting only the distinct ones).

The product of its digits is 1105920, while the sum is 46.

The spelling of 661514242438 in words is "six hundred sixty-one billion, five hundred fourteen million, two hundred forty-two thousand, four hundred thirty-eight".