18451890530 has 32 divisors (see below), whose sum is σ = 34688649600. Its totient is φ = 7053501312.

The previous prime is 18451890529. The next prime is 18451890539. The reversal of 18451890530 is 3509815481.

It is a super-2 number, since 2×18451890530² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18451890539) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 224141 + ... + 295199.

It is an arithmetic number, because the mean of its divisors is an integer number (1084020300).

Almost surely, 2^18451890530 is an apocalyptic number.

18451890530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18451890530 is a deficient number, since it is larger than the sum of its proper divisors (16236759070).

18451890530 is a wasteful number, since it uses less digits than its factorization.

18451890530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72218.

The product of its (nonzero) digits is 172800, while the sum is 44.

The spelling of 18451890530 in words is "eighteen billion, four hundred fifty-one million, eight hundred ninety thousand, five hundred thirty".