1630140561 has 48 divisors (see below), whose sum is σ = 2770604928. Its totient is φ = 904089600.

The previous prime is 1630140553. The next prime is 1630140563. The reversal of 1630140561 is 1650410361.

1630140561 is a `hidden beast` number, since 1 + 63 + 0 + 1 + 40 + 561 = 666.

It is not a de Polignac number, because 1630140561 - 2³ = 1630140553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1630140563) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1493626 + ... + 1494716.

It is an arithmetic number, because the mean of its divisors is an integer number (57720936).

Almost surely, 2^1630140561 is an apocalyptic number.

It is an amenable number.

1630140561 is a deficient number, since it is larger than the sum of its proper divisors (1140464367).

1630140561 is a wasteful number, since it uses less digits than its factorization.

1630140561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1782 (or 1779 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 1630140561 is about 40374.9992074303. Note that the first 3 decimals coincide. The cubic root of 1630140561 is about 1176.9057496172.

The spelling of 1630140561 in words is "one billion, six hundred thirty million, one hundred forty thousand, five hundred sixty-one".