6351449661 has 12 divisors (see below), whose sum is σ = 9225571680. Its totient is φ = 4210643400.

The previous prime is 6351449597. The next prime is 6351449677. The reversal of 6351449661 is 1669441536.

6351449661 is a `hidden beast` number, since 635 + 1 + 4 + 4 + 9 + 6 + 6 + 1 = 666.

It is not a de Polignac number, because 6351449661 - 2⁶ = 6351449597 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6351449681) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1969665 + ... + 1972886.

It is an arithmetic number, because the mean of its divisors is an integer number (768797640).

Almost surely, 2^6351449661 is an apocalyptic number.

It is an amenable number.

6351449661 is a deficient number, since it is larger than the sum of its proper divisors (2874122019).

6351449661 is a wasteful number, since it uses less digits than its factorization.

6351449661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3942736 (or 3942733 counting only the distinct ones).

The product of its digits is 466560, while the sum is 45.

The square root of 6351449661 is about 79695.9827155673. The cubic root of 6351449661 is about 1851.9288050860.

The spelling of 6351449661 in words is "six billion, three hundred fifty-one million, four hundred forty-nine thousand, six hundred sixty-one".