216012053561 has 4 divisors (see below), whose sum is σ = 216022278900. Its totient is φ = 216001828224.

The previous prime is 216012053513. The next prime is 216012053581. The reversal of 216012053561 is 165350210612.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 200933441536 + 15078612025 = 448256^2 + 122795^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216012053561 is a prime.

It is a super-2 number, since 2×216012053561² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216012053581) 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, 5080916 + ... + 5123253.

It is an arithmetic number, because the mean of its divisors is an integer number (54005569725).

Almost surely, 2^216012053561 is an apocalyptic number.

It is an amenable number.

216012053561 is a deficient number, since it is larger than the sum of its proper divisors (10225339).

216012053561 is a wasteful number, since it uses less digits than its factorization.

216012053561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10225338.

The product of its (nonzero) digits is 10800, while the sum is 32.

The spelling of 216012053561 in words is "two hundred sixteen billion, twelve million, fifty-three thousand, five hundred sixty-one".