18895947830649 has 24 divisors (see below), whose sum is σ = 27331475700672. Its totient is φ = 12580074692640.

The previous prime is 18895947830621. The next prime is 18895947830653. The reversal of 18895947830649 is 94603874959881.

18895947830649 is a `hidden beast` number, since 1 + 8 + 8 + 9 + 59 + 478 + 30 + 64 + 9 = 666.

It is not a de Polignac number, because 18895947830649 - 2⁴⁴ = 1303761786233 is a prime.

It is a super-2 number, since 2×18895947830649² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18895947830699) 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, 47593812 + ... + 47989194.

It is an arithmetic number, because the mean of its divisors is an integer number (1138811487528).

Almost surely, 2^{18895947830649} is an apocalyptic number.

It is an amenable number.

18895947830649 is a deficient number, since it is larger than the sum of its proper divisors (8435527870023).

18895947830649 is a wasteful number, since it uses less digits than its factorization.

18895947830649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 402637 (or 402634 counting only the distinct ones).

The product of its (nonzero) digits is 3762339840, while the sum is 81.

The spelling of 18895947830649 in words is "eighteen trillion, eight hundred ninety-five billion, nine hundred forty-seven million, eight hundred thirty thousand, six hundred forty-nine".