61108553761 has 4 divisors (see below), whose sum is σ = 63215745300. Its totient is φ = 59001362224.

The previous prime is 61108553713. The next prime is 61108553777. The reversal of 61108553761 is 16735580116.

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 50469869025 + 10638684736 = 224655^2 + 103144^2 .

It is a cyclic number.

It is not a de Polignac number, because 61108553761 - 2⁹ = 61108553249 is a prime.

It is a super-2 number, since 2×61108553761² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61108553791) 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, 1053595726 + ... + 1053595783.

It is an arithmetic number, because the mean of its divisors is an integer number (15803936325).

Almost surely, 2^61108553761 is an apocalyptic number.

It is an amenable number.

61108553761 is a deficient number, since it is larger than the sum of its proper divisors (2107191539).

61108553761 is a wasteful number, since it uses less digits than its factorization.

61108553761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2107191538.

The product of its (nonzero) digits is 151200, while the sum is 43.

The spelling of 61108553761 in words is "sixty-one billion, one hundred eight million, five hundred fifty-three thousand, seven hundred sixty-one".