661454496 has 72 divisors (see below), whose sum is σ = 1991673684. Its totient is φ = 207513600.

The previous prime is 661454491. The next prime is 661454569. The reversal of 661454496 is 694454166.

It is a happy number.

661454496 is a `hidden beast` number, since 6 + 6 + 14 + 544 + 96 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 638067600 + 23386896 = 25260^2 + 4836^2 .

It is a tau number, because it is divible by the number of its divisors (72).

It is a super-2 number, since 2×661454496² = 875044100557228032, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (661454491) 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 11 ways as a sum of consecutive naturals, for example, 62655 + ... + 72446.

Almost surely, 2^661454496 is an apocalyptic number.

It is an amenable number.

661454496 is an abundant number, since it is smaller than the sum of its proper divisors (1330219188).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

661454496 is a wasteful number, since it uses less digits than its factorization.

661454496 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135134 (or 135123 counting only the distinct ones).

The product of its digits is 622080, while the sum is 45.

The square root of 661454496 is about 25718.7576682856. The cubic root of 661454496 is about 871.2978805147.

The spelling of 661454496 in words is "six hundred sixty-one million, four hundred fifty-four thousand, four hundred ninety-six".