616736993 has 2 divisors, whose sum is σ = 616736994. Its totient is φ = 616736992.

The previous prime is 616736987. The next prime is 616737013. The reversal of 616736993 is 399637616.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 459159184 + 157577809 = 21428^2 + 12553^2 .

It is a cyclic number.

It is not a de Polignac number, because 616736993 - 2⁸ = 616736737 is a prime.

It is not a weakly prime, because it can be changed into another prime (616336993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 308368496 + 308368497.

It is an arithmetic number, because the mean of its divisors is an integer number (308368497).

Almost surely, 2^616736993 is an apocalyptic number.

It is an amenable number.

616736993 is a deficient number, since it is larger than the sum of its proper divisors (1).

616736993 is an equidigital number, since it uses as much as digits as its factorization.

616736993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1102248, while the sum is 50.

The square root of 616736993 is about 24834.1900008839. The cubic root of 616736993 is about 851.2033672990.

The spelling of 616736993 in words is "six hundred sixteen million, seven hundred thirty-six thousand, nine hundred ninety-three".