216905915452 has 12 divisors (see below), whose sum is σ = 380339998416. Its totient is φ = 108237344480.

The previous prime is 216905915399. The next prime is 216905915453. The reversal of 216905915452 is 254519509612.

It is a junction number, because it is equal to n+sod(n) for n = 216905915396 and 216905915405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216905915453) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53901049 + ... + 53905072.

It is an arithmetic number, because the mean of its divisors is an integer number (31694999868).

Almost surely, 2^216905915452 is an apocalyptic number.

It is an amenable number.

216905915452 is a deficient number, since it is larger than the sum of its proper divisors (163434082964).

216905915452 is a wasteful number, since it uses less digits than its factorization.

216905915452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107806628 (or 107806626 counting only the distinct ones).

The product of its (nonzero) digits is 972000, while the sum is 49.

The spelling of 216905915452 in words is "two hundred sixteen billion, nine hundred five million, nine hundred fifteen thousand, four hundred fifty-two".