1217947433885 has 32 divisors (see below), whose sum is σ = 1801418341632. Its totient is φ = 769804715520.

The previous prime is 1217947433851. The next prime is 1217947433887. The reversal of 1217947433885 is 5883347497121.

It is not a de Polignac number, because 1217947433885 - 2⁸ = 1217947433629 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1217947433887) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1622504 + ... + 2251313.

It is an arithmetic number, because the mean of its divisors is an integer number (56294323176).

Almost surely, 2^{1217947433885} is an apocalyptic number.

It is an amenable number.

1217947433885 is a deficient number, since it is larger than the sum of its proper divisors (583470907747).

1217947433885 is a wasteful number, since it uses less digits than its factorization.

1217947433885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3874533.

The product of its digits is 40642560, while the sum is 62.

The spelling of 1217947433885 in words is "one trillion, two hundred seventeen billion, nine hundred forty-seven million, four hundred thirty-three thousand, eight hundred eighty-five".