18868626521 has 8 divisors (see below), whose sum is σ = 18961398720. Its totient is φ = 18775945008.

The previous prime is 18868626509. The next prime is 18868626583. The reversal of 18868626521 is 12562686881.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18868626521 - 2¹⁰ = 18868625497 is a prime.

It is a super-3 number, since 3×18868626521³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18868626121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 415100 + ... + 458306.

It is an arithmetic number, because the mean of its divisors is an integer number (2370174840).

Almost surely, 2^18868626521 is an apocalyptic number.

It is an amenable number.

18868626521 is a deficient number, since it is larger than the sum of its proper divisors (92772199).

18868626521 is a wasteful number, since it uses less digits than its factorization.

18868626521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45343.

The product of its digits is 2211840, while the sum is 53.

The spelling of 18868626521 in words is "eighteen billion, eight hundred sixty-eight million, six hundred twenty-six thousand, five hundred twenty-one".