18680064650 has 48 divisors (see below), whose sum is σ = 38123669304. Its totient is φ = 6767105280.

The previous prime is 18680064649. The next prime is 18680064659. The reversal of 18680064650 is 5646008681.

It can be written as a sum of positive squares in 12 ways, for example, as 4019940409 + 14660124241 = 63403^2 + 121079^2 .

It is not an unprimeable number, because it can be changed into a prime (18680064659) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 236669 + ... + 305568.

Almost surely, 2^18680064650 is an apocalyptic number.

18680064650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18680064650 is an abundant number, since it is smaller than the sum of its proper divisors (19443604654).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18680064650 is a wasteful number, since it uses less digits than its factorization.

18680064650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 542315 (or 542310 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 44.

The spelling of 18680064650 in words is "eighteen billion, six hundred eighty million, sixty-four thousand, six hundred fifty".