1918380488644 has 24 divisors (see below), whose sum is σ = 3367679148288. Its totient is φ = 956190507360.

The previous prime is 1918380488573. The next prime is 1918380488653. The reversal of 1918380488644 is 4468840838191.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1385389 + ... + 2399179.

It is an arithmetic number, because the mean of its divisors is an integer number (140319964512).

Almost surely, 2^{1918380488644} is an apocalyptic number.

It is an amenable number.

1918380488644 is a deficient number, since it is larger than the sum of its proper divisors (1449298659644).

1918380488644 is a wasteful number, since it uses less digits than its factorization.

1918380488644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1015275 (or 1015273 counting only the distinct ones).

The product of its (nonzero) digits is 42467328, while the sum is 64.

The spelling of 1918380488644 in words is "one trillion, nine hundred eighteen billion, three hundred eighty million, four hundred eighty-eight thousand, six hundred forty-four".