1663947131544 has 96 divisors (see below), whose sum is σ = 4771980598320. Its totient is φ = 521982425088.

The previous prime is 1663947131513. The next prime is 1663947131563. The reversal of 1663947131544 is 4451317493661.

1663947131544 is a `hidden beast` number, since 1 + 6 + 6 + 3 + 94 + 7 + 1 + 3 + 1 + 544 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18544132 + ... + 18633644.

Almost surely, 2^{1663947131544} is an apocalyptic number.

It is an amenable number.

1663947131544 is an abundant number, since it is smaller than the sum of its proper divisors (3108033466776).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1663947131544 is a wasteful number, since it uses less digits than its factorization.

1663947131544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104729 (or 104722 counting only the distinct ones).

The product of its digits is 6531840, while the sum is 54.

The spelling of 1663947131544 in words is "one trillion, six hundred sixty-three billion, nine hundred forty-seven million, one hundred thirty-one thousand, five hundred forty-four".