616741805681 has 4 divisors (see below), whose sum is σ = 617021763312. Its totient is φ = 616461848052.

The previous prime is 616741805657. The next prime is 616741805689. The reversal of 616741805681 is 186508147616.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-616741805681 is a prime.

It is a super-2 number, since 2×616741805681² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (616741805689) 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, 139975511 + ... + 139979916.

It is an arithmetic number, because the mean of its divisors is an integer number (154255440828).

Almost surely, 2^616741805681 is an apocalyptic number.

It is an amenable number.

616741805681 is a deficient number, since it is larger than the sum of its proper divisors (279957631).

616741805681 is a wasteful number, since it uses less digits than its factorization.

616741805681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 279957630.

The product of its (nonzero) digits is 1935360, while the sum is 53.

The spelling of 616741805681 in words is "six hundred sixteen billion, seven hundred forty-one million, eight hundred five thousand, six hundred eighty-one".