18850191616 has 27 divisors (see below), whose sum is σ = 37631135073. Its totient is φ = 9423997440.

The previous prime is 18850191601. The next prime is 18850191623. The reversal of 18850191616 is 61619105881.

It is a happy number.

The square root of 18850191616 is 137296.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 4393216 + 18845798400 = 2096^2 + 137280^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 2192446 + ... + 2201026.

Almost surely, 2^18850191616 is an apocalyptic number.

18850191616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

18850191616 is the 137296-th square number.

It is an amenable number.

18850191616 is a deficient number, since it is larger than the sum of its proper divisors (18780943457).

18850191616 is an frugal number, since it uses more digits than its factorization.

18850191616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17178 (or 8583 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 46.

The spelling of 18850191616 in words is "eighteen billion, eight hundred fifty million, one hundred ninety-one thousand, six hundred sixteen".