30056661581 has 4 divisors (see below), whose sum is σ = 30069130464. Its totient is φ = 30044192700.

The previous prime is 30056661529. The next prime is 30056661631. The reversal of 30056661581 is 18516665003.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 30056661581 - 2¹⁴ = 30056645197 is a prime.

It is a super-2 number, since 2×30056661581² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30056661781) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6230825 + ... + 6235646.

It is an arithmetic number, because the mean of its divisors is an integer number (7517282616).

Almost surely, 2^30056661581 is an apocalyptic number.

It is an amenable number.

30056661581 is a deficient number, since it is larger than the sum of its proper divisors (12468883).

30056661581 is a wasteful number, since it uses less digits than its factorization.

30056661581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12468882.

The product of its (nonzero) digits is 129600, while the sum is 41.

The spelling of 30056661581 in words is "thirty billion, fifty-six million, six hundred sixty-one thousand, five hundred eighty-one".