216705754072 has 8 divisors (see below), whose sum is σ = 406323288900. Its totient is φ = 108352877032.

The previous prime is 216705754063. The next prime is 216705754079. The reversal of 216705754072 is 270457507612.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×216705754072² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216705754079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13544109622 + ... + 13544109637.

Almost surely, 2^216705754072 is an apocalyptic number.

It is an amenable number.

216705754072 is a deficient number, since it is larger than the sum of its proper divisors (189617534828).

216705754072 is a wasteful number, since it uses less digits than its factorization.

216705754072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27088219265 (or 27088219261 counting only the distinct ones).

The product of its (nonzero) digits is 823200, while the sum is 46.

The spelling of 216705754072 in words is "two hundred sixteen billion, seven hundred five million, seven hundred fifty-four thousand, seventy-two".