61128553405 has 8 divisors (see below), whose sum is σ = 75336811992. Its totient is φ = 47581144128.

The previous prime is 61128553399. The next prime is 61128553427. The reversal of 61128553405 is 50435582116.

It can be written as a sum of positive squares in 4 ways, for example, as 19603080121 + 41525473284 = 140011^2 + 203778^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61128553405 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 165212122 + ... + 165212491.

It is an arithmetic number, because the mean of its divisors is an integer number (9417101499).

Almost surely, 2^61128553405 is an apocalyptic number.

It is an amenable number.

61128553405 is a deficient number, since it is larger than the sum of its proper divisors (14208258587).

61128553405 is a wasteful number, since it uses less digits than its factorization.

61128553405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330424655.

The product of its (nonzero) digits is 144000, while the sum is 40.

The spelling of 61128553405 in words is "sixty-one billion, one hundred twenty-eight million, five hundred fifty-three thousand, four hundred five".