30661521040 has 20 divisors (see below), whose sum is σ = 71288036604. Its totient is φ = 12264608384.

The previous prime is 30661521031. The next prime is 30661521061. The reversal of 30661521040 is 4012516603.

It can be written as a sum of positive squares in 2 ways, for example, as 11093987584 + 19567533456 = 105328^2 + 139884^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 191634427 + ... + 191634586.

Almost surely, 2^30661521040 is an apocalyptic number.

It is an amenable number.

30661521040 is an abundant number, since it is smaller than the sum of its proper divisors (40626515564).

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

30661521040 is a wasteful number, since it uses less digits than its factorization.

30661521040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 383269026 (or 383269020 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 28.

The spelling of 30661521040 in words is "thirty billion, six hundred sixty-one million, five hundred twenty-one thousand, forty".