18981770518 has 8 divisors (see below), whose sum is σ = 29391128640. Its totient is φ = 9184727640.

The previous prime is 18981770497. The next prime is 18981770527. The reversal of 18981770518 is 81507718981.

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

It is a super-2 number, since 2×18981770518² (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 in 3 ways as a sum of consecutive naturals, for example, 153078733 + ... + 153078856.

It is an arithmetic number, because the mean of its divisors is an integer number (3673891080).

Almost surely, 2^18981770518 is an apocalyptic number.

18981770518 is a deficient number, since it is larger than the sum of its proper divisors (10409358122).

18981770518 is a wasteful number, since it uses less digits than its factorization.

18981770518 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 306157622.

The product of its (nonzero) digits is 1128960, while the sum is 55.

The spelling of 18981770518 in words is "eighteen billion, nine hundred eighty-one million, seven hundred seventy thousand, five hundred eighteen".