30000155805 has 24 divisors (see below), whose sum is σ = 52040341080. Its totient is φ = 15987753600.

The previous prime is 30000155767. The next prime is 30000155821. The reversal of 30000155805 is 50855100003.

It can be written as a sum of positive squares in 4 ways, for example, as 1810417401 + 28189738404 = 42549^2 + 167898^2 .

It is not a de Polignac number, because 30000155805 - 2¹⁸ = 29999893661 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 197670 + ... + 314759.

It is an arithmetic number, because the mean of its divisors is an integer number (2168347545).

Almost surely, 2^30000155805 is an apocalyptic number.

It is an amenable number.

30000155805 is a deficient number, since it is larger than the sum of its proper divisors (22040185275).

30000155805 is a wasteful number, since it uses less digits than its factorization.

30000155805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 513741 (or 513738 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 27.

Adding to 30000155805 its reverse (50855100003), we get a palindrome (80855255808).

The spelling of 30000155805 in words is "thirty billion, one hundred fifty-five thousand, eight hundred five".