6545216217123 has 54 divisors (see below), whose sum is σ = 9853769707236. Its totient is φ = 4341596148288.

The previous prime is 6545216217119. The next prime is 6545216217157. The reversal of 6545216217123 is 3217126125456.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

6545216217123 is a `hidden beast` number, since 6 + 5 + 4 + 5 + 2 + 1 + 621 + 7 + 12 + 3 = 666.

It is not a de Polignac number, because 6545216217123 - 2² = 6545216217119 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6545216217923) by changing a digit.

It is a polite number, since it can be written in 53 ways as a sum of consecutive naturals, for example, 13439868786 + ... + 13439869272.

Almost surely, 2^{6545216217123} is an apocalyptic number.

6545216217123 is a deficient number, since it is larger than the sum of its proper divisors (3308553490113).

6545216217123 is an frugal number, since it uses more digits than its factorization.

6545216217123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1663 (or 827 counting only the distinct ones).

The product of its digits is 604800, while the sum is 45.

The spelling of 6545216217123 in words is "six trillion, five hundred forty-five billion, two hundred sixteen million, two hundred seventeen thousand, one hundred twenty-three".