1660424240661 has 4 divisors (see below), whose sum is σ = 2213898987552. Its totient is φ = 1106949493772.

The previous prime is 1660424240653. The next prime is 1660424240663.

1660424240661 is nontrivially palindromic in base 10.

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 a cyclic number.

It is not a de Polignac number, because 1660424240661 - 2³ = 1660424240653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1660424240663) 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, 276737373441 + ... + 276737373446.

It is an arithmetic number, because the mean of its divisors is an integer number (553474746888).

Almost surely, 2^{1660424240661} is an apocalyptic number.

It is an amenable number.

1660424240661 is a deficient number, since it is larger than the sum of its proper divisors (553474746891).

1660424240661 is an equidigital number, since it uses as much as digits as its factorization.

1660424240661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 553474746890.

The product of its (nonzero) digits is 331776, while the sum is 42.

The spelling of 1660424240661 in words is "one trillion, six hundred sixty billion, four hundred twenty-four million, two hundred forty thousand, six hundred sixty-one".