61550405073 has 6 divisors (see below), whose sum is σ = 88906140674. Its totient is φ = 41033603376.

The previous prime is 61550405039. The next prime is 61550405099. The reversal of 61550405073 is 37050405516.

61550405073 is a `hidden beast` number, since 61 + 5 + 50 + 40 + 507 + 3 = 666.

It can be written as a sum of positive squares in only one way, i.e., 52451534529 + 9098870544 = 229023^2 + 95388^2 .

It is not a de Polignac number, because 61550405073 - 2¹³ = 61550396881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61550405573) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 3419466940 + ... + 3419466957.

Almost surely, 2^61550405073 is an apocalyptic number.

It is an amenable number.

61550405073 is a deficient number, since it is larger than the sum of its proper divisors (27355735601).

61550405073 is a wasteful number, since it uses less digits than its factorization.

61550405073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6838933903 (or 6838933900 counting only the distinct ones).

The product of its (nonzero) digits is 63000, while the sum is 36.

The spelling of 61550405073 in words is "sixty-one billion, five hundred fifty million, four hundred five thousand, seventy-three".