18900992646 has 24 divisors (see below), whose sum is σ = 40958444280. Its totient is φ = 6299362656.

The previous prime is 18900992587. The next prime is 18900992657. The reversal of 18900992646 is 64629900981.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 18900992592 and 18900992601.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 44985 + ... + 199563.

It is an arithmetic number, because the mean of its divisors is an integer number (1706601845).

Almost surely, 2^18900992646 is an apocalyptic number.

18900992646 is an abundant number, since it is smaller than the sum of its proper divisors (22057451634).

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

18900992646 is a wasteful number, since it uses less digits than its factorization.

18900992646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161380 (or 161377 counting only the distinct ones).

The product of its (nonzero) digits is 1679616, while the sum is 54.

The spelling of 18900992646 in words is "eighteen billion, nine hundred million, nine hundred ninety-two thousand, six hundred forty-six".