30881744505 has 20 divisors (see below), whose sum is σ = 55358387172. Its totient is φ = 16470263520.

The previous prime is 30881744501. The next prime is 30881744533. The reversal of 30881744505 is 50544718803.

It can be written as a sum of positive squares in 2 ways, for example, as 8914947561 + 21966796944 = 94419^2 + 148212^2 .

It is not a de Polignac number, because 30881744505 - 2² = 30881744501 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (30881744501) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 38125206 + ... + 38126015.

Almost surely, 2^30881744505 is an apocalyptic number.

It is an amenable number.

30881744505 is a deficient number, since it is larger than the sum of its proper divisors (24476642667).

30881744505 is an equidigital number, since it uses as much as digits as its factorization.

30881744505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76251238 (or 76251229 counting only the distinct ones).

The product of its (nonzero) digits is 537600, while the sum is 45.

The spelling of 30881744505 in words is "thirty billion, eight hundred eighty-one million, seven hundred forty-four thousand, five hundred five".