661235441 has 4 divisors (see below), whose sum is σ = 689984832. Its totient is φ = 632486052.

The previous prime is 661235437. The next prime is 661235447. The reversal of 661235441 is 144532166.

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 661235441 - 2² = 661235437 is a prime.

It is a super-3 number, since 3×661235441³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 661235398 and 661235407.

It is not an unprimeable number, because it can be changed into a prime (661235447) 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 3 ways as a sum of consecutive naturals, for example, 14374661 + ... + 14374706.

It is an arithmetic number, because the mean of its divisors is an integer number (172496208).

Almost surely, 2^661235441 is an apocalyptic number.

It is an amenable number.

661235441 is a deficient number, since it is larger than the sum of its proper divisors (28749391).

661235441 is a wasteful number, since it uses less digits than its factorization.

661235441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28749390.

The product of its digits is 17280, while the sum is 32.

The square root of 661235441 is about 25714.4986534834. The cubic root of 661235441 is about 871.2016868327.

The spelling of 661235441 in words is "six hundred sixty-one million, two hundred thirty-five thousand, four hundred forty-one".