1217672545845 has 32 divisors (see below), whose sum is σ = 2241346959360. Its totient is φ = 552963873600.

The previous prime is 1217672545811. The next prime is 1217672545847. The reversal of 1217672545845 is 5485452767121.

It is not a de Polignac number, because 1217672545845 - 2⁸ = 1217672545589 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1217672545847) 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, 38384415 + ... + 38416124.

It is an arithmetic number, because the mean of its divisors is an integer number (70042092480).

Almost surely, 2^{1217672545845} is an apocalyptic number.

1217672545845 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1217672545845 is a deficient number, since it is larger than the sum of its proper divisors (1023674413515).

1217672545845 is a wasteful number, since it uses less digits than its factorization.

1217672545845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76800705.

The product of its digits is 18816000, while the sum is 57.

The spelling of 1217672545845 in words is "one trillion, two hundred seventeen billion, six hundred seventy-two million, five hundred forty-five thousand, eight hundred forty-five".