61544351261 has 8 divisors (see below), whose sum is σ = 63769776120. Its totient is φ = 59325806848.

The previous prime is 61544351227. The next prime is 61544351291. The reversal of 61544351261 is 16215344516.

It can be written as a sum of positive squares in 4 ways, for example, as 77545636 + 61466805625 = 8806^2 + 247925^2 .

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 61544351261 - 2¹⁴ = 61544334877 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61544351221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1701896 + ... + 1737681.

It is an arithmetic number, because the mean of its divisors is an integer number (7971222015).

Almost surely, 2^61544351261 is an apocalyptic number.

It is an amenable number.

61544351261 is a deficient number, since it is larger than the sum of its proper divisors (2225424859).

61544351261 is a wasteful number, since it uses less digits than its factorization.

61544351261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3440223.

The product of its digits is 86400, while the sum is 38.

Adding to 61544351261 its reverse (16215344516), we get a palindrome (77759695777).

The spelling of 61544351261 in words is "sixty-one billion, five hundred forty-four million, three hundred fifty-one thousand, two hundred sixty-one".