1868089191644 has 96 divisors (see below), whose sum is σ = 3590672633856. Its totient is φ = 845257432320.

The previous prime is 1868089191641. The next prime is 1868089191737. The reversal of 1868089191644 is 4461919808681.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1868089191641) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 209352167 + ... + 209361089.

It is an arithmetic number, because the mean of its divisors is an integer number (37402839936).

Almost surely, 2^{1868089191644} is an apocalyptic number.

It is an amenable number.

1868089191644 is a deficient number, since it is larger than the sum of its proper divisors (1722583442212).

1868089191644 is a wasteful number, since it uses less digits than its factorization.

1868089191644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9435 (or 9433 counting only the distinct ones).

The product of its (nonzero) digits is 23887872, while the sum is 65.

The spelling of 1868089191644 in words is "one trillion, eight hundred sixty-eight billion, eighty-nine million, one hundred ninety-one thousand, six hundred forty-four".