61257555308065 has 8 divisors (see below), whose sum is σ = 74714133031848. Its totient is φ = 48202666471680.

The previous prime is 61257555308063. The next prime is 61257555308129. The reversal of 61257555308065 is 56080355575216.

It can be written as a sum of positive squares in 4 ways, for example, as 46945022224 + 61210610285841 = 216668^2 + 7823721^2 .

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

It is not a de Polignac number, because 61257555308065 - 2¹ = 61257555308063 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61257555308063) 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, 100422221512 + ... + 100422222121.

It is an arithmetic number, because the mean of its divisors is an integer number (9339266628981).

Almost surely, 2^{61257555308065} is an apocalyptic number.

It is an amenable number.

61257555308065 is a deficient number, since it is larger than the sum of its proper divisors (13456577723783).

61257555308065 is a wasteful number, since it uses less digits than its factorization.

61257555308065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200844443699.

The product of its (nonzero) digits is 37800000, while the sum is 58.

The spelling of 61257555308065 in words is "sixty-one trillion, two hundred fifty-seven billion, five hundred fifty-five million, three hundred eight thousand, sixty-five".