11978172821467 has 2 divisors, whose sum is σ = 11978172821468. Its totient is φ = 11978172821466.

The previous prime is 11978172821441. The next prime is 11978172821473. The reversal of 11978172821467 is 76412827187911.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 11978172821467 - 2¹¹ = 11978172819419 is a prime.

It is a super-2 number, since 2×11978172821467² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 11978172821399 and 11978172821408.

It is not a weakly prime, because it can be changed into another prime (11978172821767) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5989086410733 + 5989086410734.

It is an arithmetic number, because the mean of its divisors is an integer number (5989086410734).

Almost surely, 2^{11978172821467} is an apocalyptic number.

11978172821467 is a deficient number, since it is larger than the sum of its proper divisors (1).

11978172821467 is an equidigital number, since it uses as much as digits as its factorization.

11978172821467 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18966528, while the sum is 64.

The spelling of 11978172821467 in words is "eleven trillion, nine hundred seventy-eight billion, one hundred seventy-two million, eight hundred twenty-one thousand, four hundred sixty-seven".