30561980643 has 40 divisors (see below), whose sum is σ = 48179189520. Its totient is φ = 19253298240.

The previous prime is 30561980627. The next prime is 30561980663. The reversal of 30561980643 is 34608916503.

30561980643 is a `hidden beast` number, since 3 + 0 + 561 + 9 + 80 + 6 + 4 + 3 = 666.

It is not a de Polignac number, because 30561980643 - 2⁴ = 30561980627 is a prime.

It is not an unprimeable number, because it can be changed into a prime (30561980623) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 585973 + ... + 635993.

It is an arithmetic number, because the mean of its divisors is an integer number (1204479738).

Almost surely, 2^30561980643 is an apocalyptic number.

30561980643 is a deficient number, since it is larger than the sum of its proper divisors (17617208877).

30561980643 is a wasteful number, since it uses less digits than its factorization.

30561980643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50449 (or 50440 counting only the distinct ones).

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

The spelling of 30561980643 in words is "thirty billion, five hundred sixty-one million, nine hundred eighty thousand, six hundred forty-three".