1918289431672 has 32 divisors (see below), whose sum is σ = 3608499430800. Its totient is φ = 956027971584.

The previous prime is 1918289431621. The next prime is 1918289431691. The reversal of 1918289431672 is 2761349828191.

It is a self number, because there is not a number n which added to its sum of digits gives 1918289431672.

It is a congruent number.

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, 2726638 + ... + 3357250.

Almost surely, 2^{1918289431672} is an apocalyptic number.

It is an amenable number.

1918289431672 is a deficient number, since it is larger than the sum of its proper divisors (1690209999128).

1918289431672 is a wasteful number, since it uses less digits than its factorization.

1918289431672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 631855 (or 631851 counting only the distinct ones).

The product of its digits is 10450944, while the sum is 61.

The spelling of 1918289431672 in words is "one trillion, nine hundred eighteen billion, two hundred eighty-nine million, four hundred thirty-one thousand, six hundred seventy-two".