616768782731 has 4 divisors (see below), whose sum is σ = 618379145472. Its totient is φ = 615158419992.

The previous prime is 616768782719. The next prime is 616768782737. The reversal of 616768782731 is 137287867616.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-616768782731 is a prime.

It is a super-2 number, since 2×616768782731² (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 (616768782737) 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, 805180796 + ... + 805181561.

It is an arithmetic number, because the mean of its divisors is an integer number (154594786368).

Almost surely, 2^616768782731 is an apocalyptic number.

616768782731 is a deficient number, since it is larger than the sum of its proper divisors (1610362741).

616768782731 is a wasteful number, since it uses less digits than its factorization.

616768782731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1610362740.

The product of its digits is 28449792, while the sum is 62.

The spelling of 616768782731 in words is "six hundred sixteen billion, seven hundred sixty-eight million, seven hundred eighty-two thousand, seven hundred thirty-one".