61009788505 has 16 divisors (see below), whose sum is σ = 74603002320. Its totient is φ = 47880571648.

The previous prime is 61009788491. The next prime is 61009788527. The reversal of 61009788505 is 50588790016.

It can be written as a sum of positive squares in 8 ways, for example, as 1132187904 + 59877600601 = 33648^2 + 244699^2 .

It is a cyclic number.

It is not a de Polignac number, because 61009788505 - 2³⁵ = 26650050137 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3560739 + ... + 3577831.

It is an arithmetic number, because the mean of its divisors is an integer number (4662687645).

Almost surely, 2^61009788505 is an apocalyptic number.

It is an amenable number.

61009788505 is a deficient number, since it is larger than the sum of its proper divisors (13593213815).

61009788505 is a wasteful number, since it uses less digits than its factorization.

61009788505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30620.

The product of its (nonzero) digits is 604800, while the sum is 49.

The spelling of 61009788505 in words is "sixty-one billion, nine million, seven hundred eighty-eight thousand, five hundred five".