661434449 has 8 divisors (see below), whose sum is σ = 712552512. Its totient is φ = 610350480.

The previous prime is 661434443. The next prime is 661434451. The reversal of 661434449 is 944434166.

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

It is a cyclic number.

It is not a de Polignac number, because 661434449 - 2²⁸ = 392998993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (661434443) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43634 + ... + 56804.

It is an arithmetic number, because the mean of its divisors is an integer number (89069064).

Almost surely, 2^661434449 is an apocalyptic number.

It is an amenable number.

661434449 is a deficient number, since it is larger than the sum of its proper divisors (51118063).

661434449 is a wasteful number, since it uses less digits than its factorization.

661434449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17047.

The product of its digits is 248832, while the sum is 41.

The square root of 661434449 is about 25718.3679303334. The cubic root of 661434449 is about 871.2890781531.

The spelling of 661434449 in words is "six hundred sixty-one million, four hundred thirty-four thousand, four hundred forty-nine".