30505982018 has 6 divisors (see below), whose sum is σ = 45759343539. Its totient is φ = 15252867506.

The previous prime is 30505982011. The next prime is 30505982029. The reversal of 30505982018 is 81028950503.

It can be written as a sum of positive squares in only one way, i.e., 15252991009 + 15252991009 = 123503^2 + 123503^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=123503.

It is a super-2 number, since 2×30505982018² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30505982011) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 185255 + ... + 308757.

Almost surely, 2^30505982018 is an apocalyptic number.

30505982018 is a deficient number, since it is larger than the sum of its proper divisors (15253361521).

30505982018 is an frugal number, since it uses more digits than its factorization.

30505982018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247008 (or 123505 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 41.

The spelling of 30505982018 in words is "thirty billion, five hundred five million, nine hundred eighty-two thousand, eighteen".