61604053505 has 4 divisors (see below), whose sum is σ = 73924864212. Its totient is φ = 49283242800.

The previous prime is 61604053493. The next prime is 61604053513. The reversal of 61604053505 is 50535040616.

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 31509090064 + 30094963441 = 177508^2 + 173479^2 .

It is not a de Polignac number, because 61604053505 - 2⁸ = 61604053249 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6160405346 + ... + 6160405355.

It is an arithmetic number, because the mean of its divisors is an integer number (18481216053).

Almost surely, 2^61604053505 is an apocalyptic number.

It is an amenable number.

61604053505 is a deficient number, since it is larger than the sum of its proper divisors (12320810707).

61604053505 is a wasteful number, since it uses less digits than its factorization.

61604053505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12320810706.

The product of its (nonzero) digits is 54000, while the sum is 35.

The spelling of 61604053505 in words is "sixty-one billion, six hundred four million, fifty-three thousand, five hundred five".