61395749775937 has 4 divisors (see below), whose sum is σ = 61605291584340. Its totient is φ = 61186207967536.

The previous prime is 61395749775901. The next prime is 61395749775961. The reversal of 61395749775937 is 73957794759316.

It is a Cunningham number, because it is equal to 7835544²+1.

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 58088847532816 + 3306902243121 = 7621604^2 + 1818489^2 .

It is a cyclic number.

It is not a de Polignac number, because 61395749775937 - 2³¹ = 61393602292289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61395749775337) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 104770903762 + ... + 104770904347.

It is an arithmetic number, because the mean of its divisors is an integer number (15401322896085).

Almost surely, 2^{61395749775937} is an apocalyptic number.

It is an amenable number.

61395749775937 is a deficient number, since it is larger than the sum of its proper divisors (209541808403).

61395749775937 is a wasteful number, since it uses less digits than its factorization.

61395749775937 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209541808402.

The product of its digits is 9451776600, while the sum is 82.

The spelling of 61395749775937 in words is "sixty-one trillion, three hundred ninety-five billion, seven hundred forty-nine million, seven hundred seventy-five thousand, nine hundred thirty-seven".