61424516561 has 4 divisors (see below), whose sum is σ = 61450316724. Its totient is φ = 61398716400.

The previous prime is 61424516539. The next prime is 61424516617. The reversal of 61424516561 is 16561542416.

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 2618266561 + 58806250000 = 51169^2 + 242500^2 .

It is a cyclic number.

It is not a de Polignac number, because 61424516561 - 2⁶ = 61424516497 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (61424516521) 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, 12896510 + ... + 12901271.

It is an arithmetic number, because the mean of its divisors is an integer number (15362579181).

Almost surely, 2^61424516561 is an apocalyptic number.

It is an amenable number.

61424516561 is a deficient number, since it is larger than the sum of its proper divisors (25800163).

61424516561 is a wasteful number, since it uses less digits than its factorization.

61424516561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25800162.

The product of its digits is 172800, while the sum is 41.

The spelling of 61424516561 in words is "sixty-one billion, four hundred twenty-four million, five hundred sixteen thousand, five hundred sixty-one".