11217478545 has 192 divisors, whose sum is σ = 25191129600. Its totient is φ = 4490035200.

The previous prime is 11217478483. The next prime is 11217478627. The reversal of 11217478545 is 54587471211.

11217478545 is a `hidden beast` number, since 1 + 121 + 7 + 478 + 54 + 5 = 666.

It is not a de Polignac number, because 11217478545 - 2¹⁰ = 11217477521 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 11217478545.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 7005745 + ... + 7007345.

It is an arithmetic number, because the mean of its divisors is an integer number (131203800).

Almost surely, 2^11217478545 is an apocalyptic number.

11217478545 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

11217478545 is an abundant number, since it is smaller than the sum of its proper divisors (13973651055).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11217478545 is a wasteful number, since it uses less digits than its factorization.

11217478545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1720 (or 1717 counting only the distinct ones).

The product of its digits is 313600, while the sum is 45.

The spelling of 11217478545 in words is "eleven billion, two hundred seventeen million, four hundred seventy-eight thousand, five hundred forty-five".