616104561 has 4 divisors (see below), whose sum is σ = 821472752. Its totient is φ = 410736372.

The previous prime is 616104557. The next prime is 616104617. The reversal of 616104561 is 165401616.

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 not a de Polignac number, because 616104561 - 2² = 616104557 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (616104661) 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, 102684091 + ... + 102684096.

It is an arithmetic number, because the mean of its divisors is an integer number (205368188).

Almost surely, 2^616104561 is an apocalyptic number.

It is an amenable number.

616104561 is a deficient number, since it is larger than the sum of its proper divisors (205368191).

616104561 is a wasteful number, since it uses less digits than its factorization.

616104561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205368190.

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 616104561 is about 24821.4536439750. The cubic root of 616104561 is about 850.9123127283.

The spelling of 616104561 in words is "six hundred sixteen million, one hundred four thousand, five hundred sixty-one".