2181357786782 has 8 divisors (see below), whose sum is σ = 3305769017376. Its totient is φ = 1079434780992.

The previous prime is 2181357786779. The next prime is 2181357786889. The reversal of 2181357786782 is 2876877531812.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5622055958 + ... + 5622056345.

It is an arithmetic number, because the mean of its divisors is an integer number (413221127172).

Almost surely, 2^{2181357786782} is an apocalyptic number.

2181357786782 is a deficient number, since it is larger than the sum of its proper divisors (1124411230594).

2181357786782 is a wasteful number, since it uses less digits than its factorization.

2181357786782 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11244112402.

The product of its digits is 63221760, while the sum is 65.

The spelling of 2181357786782 in words is "two trillion, one hundred eighty-one billion, three hundred fifty-seven million, seven hundred eighty-six thousand, seven hundred eighty-two".