10515421718 has 4 divisors (see below), whose sum is σ = 15773132580. Its totient is φ = 5257710858.

The previous prime is 10515421691. The next prime is 10515421747. The reversal of 10515421718 is 81712451501.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81712451501 = 74131 ⋅1102271.

It is a super-2 number, since 2×10515421718² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2628855428 + ... + 2628855431.

It is an arithmetic number, because the mean of its divisors is an integer number (3943283145).

Almost surely, 2^10515421718 is an apocalyptic number.

10515421718 is a deficient number, since it is larger than the sum of its proper divisors (5257710862).

10515421718 is an equidigital number, since it uses as much as digits as its factorization.

10515421718 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5257710861.

The product of its (nonzero) digits is 11200, while the sum is 35.

The spelling of 10515421718 in words is "ten billion, five hundred fifteen million, four hundred twenty-one thousand, seven hundred eighteen".