61773764560 has 20 divisors (see below), whose sum is σ = 143624002788. Its totient is φ = 24709505792.

The previous prime is 61773764557. The next prime is 61773764587. The reversal of 61773764560 is 6546737716.

It can be written as a sum of positive squares in 2 ways, for example, as 41402482576 + 20371281984 = 203476^2 + 142728^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a junction number, because it is equal to n+sod(n) for n = 61773764498 and 61773764507.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 386085949 + ... + 386086108.

Almost surely, 2^61773764560 is an apocalyptic number.

It is an amenable number.

61773764560 is an abundant number, since it is smaller than the sum of its proper divisors (81850238228).

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

61773764560 is a wasteful number, since it uses less digits than its factorization.

61773764560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 772172070 (or 772172064 counting only the distinct ones).

The product of its (nonzero) digits is 4445280, while the sum is 52.

The spelling of 61773764560 in words is "sixty-one billion, seven hundred seventy-three million, seven hundred sixty-four thousand, five hundred sixty".