1217947064979 has 8 divisors (see below), whose sum is σ = 1624114983312. Its totient is φ = 811871928320.

The previous prime is 1217947064977. The next prime is 1217947064981. The reversal of 1217947064979 is 9794607497121.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1217947064977) and next prime (1217947064981).

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 1217947064979 - 2¹ = 1217947064977 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1217947064977) 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, 23164782 + ... + 23217299.

It is an arithmetic number, because the mean of its divisors is an integer number (203014372914).

Almost surely, 2^{1217947064979} is an apocalyptic number.

1217947064979 is a deficient number, since it is larger than the sum of its proper divisors (406167918333).

1217947064979 is an equidigital number, since it uses as much as digits as its factorization.

1217947064979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46390837.

The product of its (nonzero) digits is 48009024, while the sum is 66.

The spelling of 1217947064979 in words is "one trillion, two hundred seventeen billion, nine hundred forty-seven million, sixty-four thousand, nine hundred seventy-nine".