1540665694188 has 18 divisors (see below), whose sum is σ = 3894460504844. Its totient is φ = 513555231384.

The previous prime is 1540665694171. The next prime is 1540665694189. The reversal of 1540665694188 is 8814965660451.

1540665694188 is a `hidden beast` number, since 1 + 5 + 4 + 0 + 66 + 569 + 4 + 1 + 8 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a hoax number, since the sum of its digits (63) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (1540665694189) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 21398134606 + ... + 21398134677.

Almost surely, 2^{1540665694188} is an apocalyptic number.

1540665694188 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1540665694188 is an abundant number, since it is smaller than the sum of its proper divisors (2353794810656).

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

1540665694188 is a wasteful number, since it uses less digits than its factorization.

1540665694188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42796269293 (or 42796269288 counting only the distinct ones).

The product of its (nonzero) digits is 49766400, while the sum is 63.

The spelling of 1540665694188 in words is "one trillion, five hundred forty billion, six hundred sixty-five million, six hundred ninety-four thousand, one hundred eighty-eight".