18427980515 has 12 divisors (see below), whose sum is σ = 25723956816. Its totient is φ = 12636329328.

The previous prime is 18427980503. The next prime is 18427980523. The reversal of 18427980515 is 51508972481.

It is not a de Polignac number, because 18427980515 - 2¹² = 18427976419 is a prime.

It is a super-2 number, since 2×18427980515² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 37607879 + ... + 37608368.

It is an arithmetic number, because the mean of its divisors is an integer number (2143663068).

Almost surely, 2^18427980515 is an apocalyptic number.

18427980515 is a deficient number, since it is larger than the sum of its proper divisors (7295976301).

18427980515 is an equidigital number, since it uses as much as digits as its factorization.

18427980515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75216266 (or 75216259 counting only the distinct ones).

The product of its (nonzero) digits is 806400, while the sum is 50.

The spelling of 18427980515 in words is "eighteen billion, four hundred twenty-seven million, nine hundred eighty thousand, five hundred fifteen".