2178642459997 has 8 divisors (see below), whose sum is σ = 2182626232640. Its totient is φ = 2174660369280.

The previous prime is 2178642459881. The next prime is 2178642460009. The reversal of 2178642459997 is 7999542468712.

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

It is a cyclic number.

It is not a de Polignac number, because 2178642459997 - 2⁷ = 2178642459869 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2178642459197) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2187298 + ... + 3023500.

It is an arithmetic number, because the mean of its divisors is an integer number (272828279080).

Almost surely, 2^{2178642459997} is an apocalyptic number.

It is an amenable number.

2178642459997 is a deficient number, since it is larger than the sum of its proper divisors (3983772643).

2178642459997 is an equidigital number, since it uses as much as digits as its factorization.

2178642459997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 840963.

The product of its digits is 548674560, while the sum is 73.

The spelling of 2178642459997 in words is "two trillion, one hundred seventy-eight billion, six hundred forty-two million, four hundred fifty-nine thousand, nine hundred ninety-seven".