61218247061 has 4 divisors (see below), whose sum is σ = 61225307724. Its totient is φ = 61211186400.

The previous prime is 61218247049. The next prime is 61218247063. The reversal of 61218247061 is 16074281216.

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 44486824561 + 16731422500 = 210919^2 + 129350^2 .

It is a cyclic number.

It is not a de Polignac number, because 61218247061 - 2³⁰ = 60144505237 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61218247063) 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, 3517310 + ... + 3534671.

It is an arithmetic number, because the mean of its divisors is an integer number (15306326931).

Almost surely, 2^61218247061 is an apocalyptic number.

It is an amenable number.

61218247061 is a deficient number, since it is larger than the sum of its proper divisors (7060663).

61218247061 is an equidigital number, since it uses as much as digits as its factorization.

61218247061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7060662.

The product of its (nonzero) digits is 32256, while the sum is 38.

The spelling of 61218247061 in words is "sixty-one billion, two hundred eighteen million, two hundred forty-seven thousand, sixty-one".