61505021105 has 32 divisors (see below), whose sum is σ = 81518576256. Its totient is φ = 44176000000.

The previous prime is 61505021059. The next prime is 61505021129. The reversal of 61505021105 is 50112050516.

61505021105 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 61505021105 - 2⁶ = 61505021041 is a prime.

It is a super-2 number, since 2×61505021105² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2213750 + ... + 2241360.

It is an arithmetic number, because the mean of its divisors is an integer number (2547455508).

Almost surely, 2^61505021105 is an apocalyptic number.

It is an amenable number.

61505021105 is a deficient number, since it is larger than the sum of its proper divisors (20013555151).

61505021105 is a wasteful number, since it uses less digits than its factorization.

61505021105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28129.

The product of its (nonzero) digits is 1500, while the sum is 26.

The spelling of 61505021105 in words is "sixty-one billion, five hundred five million, twenty-one thousand, one hundred five".