61242055559 has 4 divisors (see below), whose sum is σ = 61632132504. Its totient is φ = 60851978616.

The previous prime is 61242055529. The next prime is 61242055583. The reversal of 61242055559 is 95555024216.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 61242055559 - 2¹² = 61242051463 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61242055529) 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, 195038237 + ... + 195038550.

It is an arithmetic number, because the mean of its divisors is an integer number (15408033126).

Almost surely, 2^61242055559 is an apocalyptic number.

61242055559 is a deficient number, since it is larger than the sum of its proper divisors (390076945).

61242055559 is a wasteful number, since it uses less digits than its factorization.

61242055559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 390076944.

The product of its (nonzero) digits is 540000, while the sum is 44.

The spelling of 61242055559 in words is "sixty-one billion, two hundred forty-two million, fifty-five thousand, five hundred fifty-nine".