661301023441 has 4 divisors (see below), whose sum is σ = 662141305072. Its totient is φ = 660460741812.

The previous prime is 661301023429. The next prime is 661301023469. The reversal of 661301023441 is 144320103166.

It is a happy number.

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 a de Polignac number, because none of the positive numbers 2^k-661301023441 is a prime.

It is a super-2 number, since 2×661301023441² (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 (661301020441) 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, 420139635 + ... + 420141208.

It is an arithmetic number, because the mean of its divisors is an integer number (165535326268).

Almost surely, 2^661301023441 is an apocalyptic number.

It is an amenable number.

661301023441 is a deficient number, since it is larger than the sum of its proper divisors (840281631).

661301023441 is an equidigital number, since it uses as much as digits as its factorization.

661301023441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 840281630.

The product of its (nonzero) digits is 10368, while the sum is 31.

The spelling of 661301023441 in words is "six hundred sixty-one billion, three hundred one million, twenty-three thousand, four hundred forty-one".