604639999561 has 4 divisors (see below), whose sum is σ = 651150768772. Its totient is φ = 558129230352.

The previous prime is 604639999489. The next prime is 604639999571. The reversal of 604639999561 is 165999936406.

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

It can be written as a sum of positive squares in 2 ways, for example, as 38895333961 + 565744665600 = 197219^2 + 752160^2 .

It is a cyclic number.

It is not a de Polignac number, because 604639999561 - 2³⁵ = 570280261193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (604639999571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23255384586 + ... + 23255384611.

It is an arithmetic number, because the mean of its divisors is an integer number (162787692193).

Almost surely, 2^604639999561 is an apocalyptic number.

It is an amenable number.

604639999561 is a deficient number, since it is larger than the sum of its proper divisors (46510769211).

604639999561 is a wasteful number, since it uses less digits than its factorization.

604639999561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46510769210.

The product of its (nonzero) digits is 85030560, while the sum is 67.

The spelling of 604639999561 in words is "six hundred four billion, six hundred thirty-nine million, nine hundred ninety-nine thousand, five hundred sixty-one".