61539044827 has 8 divisors (see below), whose sum is σ = 66275980400. Its totient is φ = 56802561120.

The previous prime is 61539044779. The next prime is 61539044891. The reversal of 61539044827 is 72844093516.

It is a happy number.

61539044827 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61539044827 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61539044227) 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, 202549 + ... + 405097.

It is an arithmetic number, because the mean of its divisors is an integer number (8284497550).

It is a 2-persistent number, because it is pandigital, and so is 2⋅61539044827 = 123078089654, but 3⋅61539044827 = 184617134481 is not.

Almost surely, 2^61539044827 is an apocalyptic number.

61539044827 is the 202549-th pentagonal number.

61539044827 is a deficient number, since it is larger than the sum of its proper divisors (4736935573).

61539044827 is a wasteful number, since it uses less digits than its factorization.

61539044827 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225933.

The product of its (nonzero) digits is 1451520, while the sum is 49.

The spelling of 61539044827 in words is "sixty-one billion, five hundred thirty-nine million, forty-four thousand, eight hundred twenty-seven".