18947265530 has 16 divisors (see below), whose sum is σ = 34110693000. Its totient is φ = 7577658432.

The previous prime is 18947265511. The next prime is 18947265551. The reversal of 18947265530 is 3556274981.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 17978250889 + 969014641 = 134083^2 + 31129^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 90905 + ... + 214844.

It is a 1-persistent number, because it is pandigital, but 2⋅18947265530 = 37894531060 is not.

Almost surely, 2^18947265530 is an apocalyptic number.

18947265530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18947265530 is a deficient number, since it is larger than the sum of its proper divisors (15163427470).

18947265530 is a wasteful number, since it uses less digits than its factorization.

18947265530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 311953.

The product of its (nonzero) digits is 1814400, while the sum is 50.

The spelling of 18947265530 in words is "eighteen billion, nine hundred forty-seven million, two hundred sixty-five thousand, five hundred thirty".