661481449 has 16 divisors (see below), whose sum is σ = 710506368. Its totient is φ = 614224512.

The previous prime is 661481437. The next prime is 661481459. The reversal of 661481449 is 944184166.

It is a cyclic number.

It is not a de Polignac number, because 661481449 - 2⁵ = 661481417 is a prime.

It is a super-2 number, since 2×661481449² = 875115414742279202, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (661481459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 728854 + ... + 729760.

It is an arithmetic number, because the mean of its divisors is an integer number (44406648).

Almost surely, 2^661481449 is an apocalyptic number.

It is an amenable number.

661481449 is a deficient number, since it is larger than the sum of its proper divisors (49024919).

661481449 is a wasteful number, since it uses less digits than its factorization.

661481449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1824.

The product of its digits is 165888, while the sum is 43.

The square root of 661481449 is about 25719.2816579313. The cubic root of 661481449 is about 871.3097149256.

The spelling of 661481449 in words is "six hundred sixty-one million, four hundred eighty-one thousand, four hundred forty-nine".