61005105511 has 16 divisors (see below), whose sum is σ = 70793243136. Its totient is φ = 51491104416.

The previous prime is 61005105487. The next prime is 61005105527. The reversal of 61005105511 is 11550150016.

It is a cyclic number.

It is not a de Polignac number, because 61005105511 - 2¹¹ = 61005103463 is a prime.

It is a super-2 number, since 2×61005105511² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61005105571) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 118776 + ... + 368941.

It is an arithmetic number, because the mean of its divisors is an integer number (4424577696).

Almost surely, 2^61005105511 is an apocalyptic number.

61005105511 is a deficient number, since it is larger than the sum of its proper divisors (9788137625).

61005105511 is a wasteful number, since it uses less digits than its factorization.

61005105511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 487998.

The product of its (nonzero) digits is 750, while the sum is 25.

Adding to 61005105511 its reverse (11550150016), we get a palindrome (72555255527).

The spelling of 61005105511 in words is "sixty-one billion, five million, one hundred five thousand, five hundred eleven".