1988094185649 has 192 divisors, whose sum is σ = 3617560396800. Its totient is φ = 1068823641600.

The previous prime is 1988094185641. The next prime is 1988094185657. The reversal of 1988094185649 is 9465814908891.

1988094185649 is a `hidden beast` number, since 1 + 98 + 80 + 9 + 418 + 5 + 6 + 49 = 666.

It is an interprime number because it is at equal distance from previous prime (1988094185641) and next prime (1988094185657).

It is not a de Polignac number, because 1988094185649 - 2³ = 1988094185641 is a prime.

It is a super-2 number, since 2×1988094185649² (a number of 25 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1988094185641) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 137872962 + ... + 137887380.

It is an arithmetic number, because the mean of its divisors is an integer number (18841460400).

Almost surely, 2^{1988094185649} is an apocalyptic number.

It is an amenable number.

1988094185649 is a deficient number, since it is larger than the sum of its proper divisors (1629466211151).

1988094185649 is a wasteful number, since it uses less digits than its factorization.

1988094185649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14573 (or 14554 counting only the distinct ones).

The product of its (nonzero) digits is 179159040, while the sum is 72.

The spelling of 1988094185649 in words is "one trillion, nine hundred eighty-eight billion, ninety-four million, one hundred eighty-five thousand, six hundred forty-nine".