18646988446 has 4 divisors (see below), whose sum is σ = 27970482672. Its totient is φ = 9323494222.

The previous prime is 18646988431. The next prime is 18646988453. The reversal of 18646988446 is 64488964681.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 64488964681 = 337 ⋅191361913.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4661747110 + ... + 4661747113.

It is an arithmetic number, because the mean of its divisors is an integer number (6992620668).

Almost surely, 2^18646988446 is an apocalyptic number.

18646988446 is a deficient number, since it is larger than the sum of its proper divisors (9323494226).

18646988446 is an equidigital number, since it uses as much as digits as its factorization.

18646988446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9323494225.

The product of its digits is 63700992, while the sum is 64.

The spelling of 18646988446 in words is "eighteen billion, six hundred forty-six million, nine hundred eighty-eight thousand, four hundred forty-six".