61268578009 has 4 divisors (see below), whose sum is σ = 61269073380. Its totient is φ = 61268082640.

The previous prime is 61268577977. The next prime is 61268578013. The reversal of 61268578009 is 90087586216.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 5362339984 + 55906238025 = 73228^2 + 236445^2 .

It is a cyclic number.

It is not a de Polignac number, because 61268578009 - 2⁵ = 61268577977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61268578109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 110487 + ... + 367075.

It is an arithmetic number, because the mean of its divisors is an integer number (15317268345).

Almost surely, 2^61268578009 is an apocalyptic number.

It is an amenable number.

61268578009 is a deficient number, since it is larger than the sum of its proper divisors (495371).

61268578009 is a wasteful number, since it uses less digits than its factorization.

61268578009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 495370.

The product of its (nonzero) digits is 1451520, while the sum is 52.

The spelling of 61268578009 in words is "sixty-one billion, two hundred sixty-eight million, five hundred seventy-eight thousand, nine".