616406561361 has 32 divisors (see below), whose sum is σ = 926264611200. Its totient is φ = 405091886400.

The previous prime is 616406561359. The next prime is 616406561369. The reversal of 616406561361 is 163165604616.

616406561361 is a `hidden beast` number, since 6 + 16 + 40 + 6 + 561 + 36 + 1 = 666.

It is not a de Polignac number, because 616406561361 - 2¹ = 616406561359 is a prime.

It is not an unprimeable number, because it can be changed into a prime (616406561369) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 130950 + ... + 1118016.

It is an arithmetic number, because the mean of its divisors is an integer number (28945769100).

Almost surely, 2^616406561361 is an apocalyptic number.

It is an amenable number.

616406561361 is a deficient number, since it is larger than the sum of its proper divisors (309858049839).

616406561361 is a wasteful number, since it uses less digits than its factorization.

616406561361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 987406 (or 987400 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 45.

The spelling of 616406561361 in words is "six hundred sixteen billion, four hundred six million, five hundred sixty-one thousand, three hundred sixty-one".