61005561101 has 4 divisors (see below), whose sum is σ = 61108437852. Its totient is φ = 60902684352.

The previous prime is 61005561091. The next prime is 61005561107. The reversal of 61005561101 is 10116550016.

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 31327230025 + 29678331076 = 176995^2 + 172274^2 .

It is a cyclic number.

It is not a de Polignac number, because 61005561101 - 2⁶ = 61005561037 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 (61005561107) 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, 51437486 + ... + 51438671.

It is an arithmetic number, because the mean of its divisors is an integer number (15277109463).

Almost surely, 2^61005561101 is an apocalyptic number.

It is an amenable number.

61005561101 is a deficient number, since it is larger than the sum of its proper divisors (102876751).

61005561101 is a wasteful number, since it uses less digits than its factorization.

61005561101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102876750.

The product of its (nonzero) digits is 900, while the sum is 26.

The spelling of 61005561101 in words is "sixty-one billion, five million, five hundred sixty-one thousand, one hundred one".