2156243461006 has 4 divisors (see below), whose sum is σ = 3234365191512. Its totient is φ = 1078121730502.

The previous prime is 2156243460991. The next prime is 2156243461039. The reversal of 2156243461006 is 6001643426512.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×2156243461006² (a number of 25 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 2156243461006.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 539060865250 + ... + 539060865253.

It is an arithmetic number, because the mean of its divisors is an integer number (808591297878).

Almost surely, 2^{2156243461006} is an apocalyptic number.

2156243461006 is a deficient number, since it is larger than the sum of its proper divisors (1078121730506).

2156243461006 is a wasteful number, since it uses less digits than its factorization.

2156243461006 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1078121730505.

The product of its (nonzero) digits is 207360, while the sum is 40.

Adding to 2156243461006 its reverse (6001643426512), we get a palindrome (8157886887518).

The spelling of 2156243461006 in words is "two trillion, one hundred fifty-six billion, two hundred forty-three million, four hundred sixty-one thousand, six".