616636061 has 2 divisors, whose sum is σ = 616636062. Its totient is φ = 616636060.

The previous prime is 616635997. The next prime is 616636063. The reversal of 616636061 is 160636616.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 420496036 + 196140025 = 20506^2 + 14005^2 .

It is a cyclic number.

It is not a de Polignac number, because 616636061 - 2⁶ = 616635997 is a prime.

Together with 616636063, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (616636063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 308318030 + 308318031.

It is an arithmetic number, because the mean of its divisors is an integer number (308318031).

Almost surely, 2^616636061 is an apocalyptic number.

It is an amenable number.

616636061 is a deficient number, since it is larger than the sum of its proper divisors (1).

616636061 is an equidigital number, since it uses as much as digits as its factorization.

616636061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 35.

The square root of 616636061 is about 24832.1577999174. The cubic root of 616636061 is about 851.1569302460.

The spelling of 616636061 in words is "six hundred sixteen million, six hundred thirty-six thousand, sixty-one".