61613454636421 has 8 divisors (see below), whose sum is σ = 62223959025144. Its totient is φ = 61002959467200.

The previous prime is 61613454636403. The next prime is 61613454636443. The reversal of 61613454636421 is 12463645431616.

It can be written as a sum of positive squares in 4 ways, for example, as 23310414423396 + 38303040213025 = 4828086^2 + 6188945^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 61613454636421 - 2¹¹ = 61613454634373 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 (61613454636121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11537035 + ... + 16010311.

It is an arithmetic number, because the mean of its divisors is an integer number (7777994878143).

Almost surely, 2^{61613454636421} is an apocalyptic number.

It is an amenable number.

61613454636421 is a deficient number, since it is larger than the sum of its proper divisors (610504388723).

61613454636421 is a wasteful number, since it uses less digits than its factorization.

61613454636421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4609751.

The product of its digits is 7464960, while the sum is 52.

The spelling of 61613454636421 in words is "sixty-one trillion, six hundred thirteen billion, four hundred fifty-four million, six hundred thirty-six thousand, four hundred twenty-one".