616036661 has 4 divisors (see below), whose sum is σ = 629143872. Its totient is φ = 602929452.

The previous prime is 616036637. The next prime is 616036679. The reversal of 616036661 is 166630616.

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 not a de Polignac number, because 616036661 - 2¹⁸ = 615774517 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (616036691) 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, 6553535 + ... + 6553628.

It is an arithmetic number, because the mean of its divisors is an integer number (157285968).

Almost surely, 2^616036661 is an apocalyptic number.

It is an amenable number.

616036661 is a deficient number, since it is larger than the sum of its proper divisors (13107211).

616036661 is a wasteful number, since it uses less digits than its factorization.

616036661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13107210.

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

The square root of 616036661 is about 24820.0858378854. The cubic root of 616036661 is about 850.8810523047.

The spelling of 616036661 in words is "six hundred sixteen million, thirty-six thousand, six hundred sixty-one".