18691345240 has 16 divisors (see below), whose sum is σ = 42055526880. Its totient is φ = 7476538080.

The previous prime is 18691345237. The next prime is 18691345271. The reversal of 18691345240 is 4254319681.

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, 233641776 + ... + 233641855.

It is an arithmetic number, because the mean of its divisors is an integer number (2628470430).

Almost surely, 2^18691345240 is an apocalyptic number.

18691345240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18691345240 is an abundant number, since it is smaller than the sum of its proper divisors (23364181640).

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

18691345240 is a wasteful number, since it uses less digits than its factorization.

18691345240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 467283642 (or 467283638 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 43.

The spelling of 18691345240 in words is "eighteen billion, six hundred ninety-one million, three hundred forty-five thousand, two hundred forty".