61155065610 has 80 divisors (see below), whose sum is σ = 164689391592. Its totient is φ = 16283203200.

The previous prime is 61155065579. The next prime is 61155065689. The reversal of 61155065610 is 1656055116.

It can be written as a sum of positive squares in 4 ways, for example, as 56065241961 + 5089823649 = 236781^2 + 71343^2 .

It is a Curzon number.

It is an unprimeable number.

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 39 ways as a sum of consecutive naturals, for example, 478300 + ... + 592520.

Almost surely, 2^61155065610 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61155065610, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82344695796).

61155065610 is an abundant number, since it is smaller than the sum of its proper divisors (103534325982).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61155065610 is a wasteful number, since it uses less digits than its factorization.

61155065610 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114901 (or 114892 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 36.

The spelling of 61155065610 in words is "sixty-one billion, one hundred fifty-five million, sixty-five thousand, six hundred ten".