61564040011 has 4 divisors (see below), whose sum is σ = 61941733672. Its totient is φ = 61186346352.

The previous prime is 61564040009. The next prime is 61564040017. The reversal of 61564040011 is 11004046516.

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 61564040011 - 2¹ = 61564040009 is a prime.

It is a super-3 number, since 3×61564040011³ (a number of 33 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61564040017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 188846586 + ... + 188846911.

It is an arithmetic number, because the mean of its divisors is an integer number (15485433418).

Almost surely, 2^61564040011 is an apocalyptic number.

61564040011 is a deficient number, since it is larger than the sum of its proper divisors (377693661).

61564040011 is a wasteful number, since it uses less digits than its factorization.

61564040011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 377693660.

The product of its (nonzero) digits is 2880, while the sum is 28.

Adding to 61564040011 its reverse (11004046516), we get a palindrome (72568086527).

The spelling of 61564040011 in words is "sixty-one billion, five hundred sixty-four million, forty thousand, eleven".